Location: Main at Broadway Date: 10-14-12 Time Start 0:00 0:15 0:30 0:45 1:00 1:15 1:30 1:45 2:00 2:15 2:30 2:45 3:00 3:15 3:30 3:45 4:00 4:15 4:30 4:45 5:00 5:15 5:30 5:45 6:00 6:15 6:30 6:45 7:00 7:15 7:30 7:45 8:00 8:15 8:30 8:45 9:00 9:15 9:30 9:45 10:00 10:15 10:30 10:45 11:00 11:15 11:30 11:45 12:00 12:15 12:30 12:45 13:00 13:15 13:30 13:45 14:00 14:15 14:30 14:45 15:00 15:15 15:30 15:45 16:00 16:15 16:30 16:45 17:00 17:15 17:30 17:45 18:00 18:15 18:30 18:45 19:00 19:15 19:30 19:45 20:00 20:15 20:30 20:45 21:00 21:15 21:30 21:45 22:00 22:15 22:30 22:45 23:00 23:15 23:30 23:45 End 0:15 0:30 0:45 1:00 1:15 1:30 1:45 2:00 2:15 2:30 2:45 3:00 3:15 3:30 3:45 4:00 4:15 4:30 4:45 5:00 5:15 5:30 5:45 6:00 6:15 6:30 6:45 7:00 7:15 7:30 7:45 8:00 8:15 8:30 8:45 9:00 9:15 9:30 9:45 10:00 10:15 10:30 10:45 11:00 11:15 11:30 11:45 12:00 12:15 12:30 12:45 13:00 13:15 13:30 13:45 14:00 14:15 14:30 14:45 15:00 15:15 15:30 15:45 16:00 16:15 16:30 16:45 17:00 17:15 17:30 17:45 18:00 18:15 18:30 18:45 19:00 19:15 19:30 19:45 20:00 20:15 20:30 20:45 21:00 21:15 21:30 21:45 22:00 22:15 22:30 22:45 23:00 23:15 23:30 23:45 0:00 U Left 1 0 0 1 0 0 1 0 2 3 1 0 2 1 1 4 2 2 3 4 8 2 3 7 2 4 9 10 6 2 4 9 2 10 8 6 5 6 4 7 2 3 4 5 2 3 4 6 5 7 6 4 2 3 2 4 2 3 2 2 4 5 3 2 4 2 3 1 5 4 2 2 3 1 2 1 2 0 1 2 0 1 0 1 2 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 2 0 0 2 5 3 0 0 1 0 0 2 1 5 6 5 6 4 3 6 10 15 23 30 50 75 80 100 50 30 24 28 24 23 18 19 22 21 26 22 26 21 18 23 24 28 20 26 29 30 26 24 25 23 20 20 19 21 22 26 24 23 30 35 36 38 40 45 45 43 42 40 41 42 39 38 36 34 32 32 30 31 30 28 29 24 22 21 9 8 6 4 North Bound Thru Right 50 3 50 2 50 1 10 3 12 6 15 2 8 0 50 10 20 8 10 5 0 1 0 1 5 0 8 2 6 3 10 5 25 6 50 8 100 10 350 15 400 25 325 20 400 28 450 26 500 30 550 35 600 40 800 50 760 45 825 55 810 58 775 53 790 55 750 56 740 58 700 60 700 55 650 53 630 56 620 55 600 54 610 56 570 50 600 51 620 48 650 45 675 46 700 44 750 49 720 48 740 45 780 44 800 46 750 43 735 42 710 41 700 40 695 39 665 38 650 39 675 38 680 37 700 38 750 40 800 42 835 45 850 46 900 48 910 50 925 55 950 56 950 54 930 53 640 48 925 42 910 45 900 48 895 46 890 49 880 48 870 51 700 43 650 42 630 41 600 38 550 34 500 35 400 36 300 30 250 28 200 24 100 18 50 15 50 10 25 12 30 13 U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 0 0 2 1 3 2 1 1 1 1 0 1 2 0 2 0 0 0 1 0 1 2 2 1 0 0 0 2 1 3 2 1 0 2 3 5 4 6 2 1 0 0 2 1 3 0 0 1 2 4 8 6 8 10 3 6 4 2 6 8 6 5 4 8 2 1 0 4 6 2 3 1 0 2 5 1 0 0 0 South Bound Left Thru Right 1 10 2 2 10 1 3 10 0 5 15 2 3 15 0 2 20 0 5 25 2 6 30 1 8 15 3 2 10 6 1 5 5 0 5 2 0 6 2 0 8 3 1 10 2 2 25 1 3 35 6 5 100 5 4 150 8 8 200 10 20 200 25 50 250 45 20 250 46 20 260 55 30 300 60 50 325 75 75 300 70 80 325 68 90 200 65 100 275 64 80 300 63 50 275 66 35 250 56 40 300 68 35 350 65 35 345 62 28 330 63 29 340 61 33 350 58 34 375 55 38 400 53 42 425 54 43 450 57 41 500 58 38 550 62 35 600 62 31 625 63 35 650 67 40 675 75 42 700 72 44 710 70 45 750 68 40 750 78 55 730 53 45 740 52 40 750 51 48 750 50 46 725 48 47 710 47 42 700 52 41 700 51 54 750 56 56 775 66 65 800 67 62 835 62 66 855 69 68 875 72 70 925 68 72 950 62 70 1000 61 71 1025 58 68 1050 59 65 1000 58 60 100 56 54 950 55 52 940 54 55 935 53 68 925 52 175 900 50 22 875 43 45 850 40 54 800 38 53 750 37 41 700 32 30 680 30 20 640 24 15 620 15 10 600 18 11 500 12 9 400 6 5 275 5 8 175 4 2 75 2 8 30 2 2 15 6 1 15 5 U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 West Bound Left Thru Right 0 0 1 0 2 0 1 3 2 2 5 0 0 2 4 0 1 1 1 0 3 2 2 0 1 0 2 2 2 0 1 0 0 2 0 0 0 1 1 0 2 2 0 2 3 0 5 4 2 5 6 3 6 8 4 8 12 6 15 15 5 25 20 8 35 22 15 45 23 25 60 335 30 75 27 32 90 36 36 100 42 42 125 51 41 150 44 45 175 38 48 150 34 46 140 36 45 135 32 41 130 21 35 140 22 30 130 26 28 125 27 27 120 25 23 110 26 20 100 31 18 90 36 19 95 38 20 100 24 22 130 26 20 140 20 30 145 29 35 140 33 42 145 42 55 150 50 54 150 51 56 145 56 50 140 53 36 145 51 24 150 54 22 120 52 26 110 53 28 100 54 29 95 39 30 100 41 32 100 36 45 110 34 42 130 32 41 140 56 38 120 59 36 110 60 34 120 75 55 125 85 65 120 65 78 110 75 85 130 62 58 135 57 51 130 54 50 125 56 48 120 49 44 120 47 41 110 43 38 100 45 26 90 38 28 90 32 21 83 29 23 70 27 22 30 27 18 20 28 20 25 26 17 20 24 14 16 22 16 10 23 10 8 21 4 6 18 5 5 19 8 2 14 6 3 13 7 2 12 2 1 8 3 2 9 4 3 2 U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 East Bound Left Thru Right 0 1 2 1 2 1 2 0 0 3 2 2 2 4 5 4 1 3 5 0 0 1 5 2 2 2 0 6 6 1 3 8 4 4 2 5 5 1 2 6 0 0 7 0 0 4 5 1 2 6 2 1 8 6 0 15 12 6 12 18 25 15 25 27 30 36 26 30 42 31 40 55 38 50 57 45 60 62 56 70 67 68 75 66 62 85 69 69 90 72 71 100 75 72 100 105 69 110 100 64 100 98 65 120 92 54 100 87 57 95 86 52 100 75 48 90 62 49 90 52 52 80 42 51 75 56 62 80 57 68 80 54 71 90 51 81 100 48 82 110 52 91 120 46 88 130 59 87 136 62 85 130 61 82 120 58 84 115 60 78 130 55 76 110 54 75 100 52 71 90 51 68 80 48 77 80 43 76 90 56 82 120 36 85 125 0 89 130 42 88 150 46 85 110 47 84 130 58 89 120 62 90 110 66 92 115 64 100 116 58 105 126 69 98 119 57 92 114 68 95 108 71 85 102 72 82 100 56 81 98 54 76 82 52 78 79 50 71 73 48 68 69 44 69 61 42 58 30 30 51 22 24 46 17 18 44 14 16 38 10 14 28 8 10 24 6 8 20 3 6 18 5 4 10 4 2 8 8 4 6 2 2 4 1 2 2 3 1 1/1/2013 1/1/2015 1,00 24,00 Date Hour Minute 9/27/13 23 16 1/28/13 12 5 9/15/13 5 37 9/23/13 15 54 3/29/13 5 25 3/8/13 3 18 7/25/13 11 9 8/15/14 8 19 5/22/13 23 52 3/9/13 16 32 11/12/13 5 54 4/24/13 10 17 6/26/13 17 29 2/11/13 6 59 12/8/14 11 15 1/11/13 21 18 8/21/14 5 31 8/23/13 23 42 2/25/14 2 8 5/12/13 24 42 7/30/13 13 36 7/8/14 11 33 7/22/13 20 18 12/4/14 8 49 1/24/14 22 6 3/18/13 14 37 4/14/14 20 59 12/19/14 24 49 Vehicle 1 Direction Movement NB LT WB RT WB T SB T EB RT NB UT WB LT SB RT SB LT WB T EB LT EB LT NB LT SB T WB RT NB T WB UT EB T NB LT SB RT WB RT NB T EB LT WB LT NB T WB LT EB RT SB T Type PC PC PC MC PC PC PC TK PC PC PC PC PC PC PC TK TK TK PC PC PC PC PC PC B PC PC PC Severity PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD Injuries Y F Y Y Y F Vehicle 2 Direction Movement Type SB T PC NB UT PC NB LT PC WB RT TK EB T P NB LT PC WB T B SB RT PC EB T PC NB T PC EB T PC SB LT PC SB T PC WB LT TK WB RT PC SB T PC NB T PC EB T PC WB T PC EB UT PC WB RT PC NB T TK EB UT PC WB T PC NB LT PC SB T PC SB T PC SB T PC Severity PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD Injuries F Y Y Y Y Y 5/9/14 1/21/13 3/29/13 3/23/14 15 21 9 14 1 38 13 22 WB NB WB SB T RT LT T PC TK PC PC PD PD PD PD Y WB NB EB SB LT T T T PC PC P PC PD PD PD PD F Collision Diagrams Collision diagrams are used to display and identify similar accident patterns. They provide information on the type and number of accidents; including conditions such as time of day, day of week, climatic conditions, pavement conditions, and other information critical to determining the causes of safety problems. Accident reports should be organized by year of occurrence and accident type for the analysis period. Accidents that occurred after significant changes in highway or local land use should not be included. A. Construction of Collision Diagram Sketch the location diagram for either an intersection or roadway section using a standard form, such as, shown on the following page. 1. The sketch need not be to scale. 2. Show the path of each vehicle involved in the accident with adequate room for information. 3. 4. Place a north arrow for orientation and any other descriptive information: a. Location identification b. Period of analysis c. Label the roads Sketch the path of each vehicle to show vehicle maneuver, type of collision and accident severity, and; a. Time of day b. Day of week c. Date d. Lighting condition e. Pavement condition f. Other important information, e.g., alcohol involvement Collision Diagrams B. -2- Permit Writers Workshop Symbols Symbols representing the nature of operation, vehicle or object involved and severity of the accident are adopted. These are shown in the example collision diagram on the following page. Symbols to represent types of collisions diagrams are also standardized. C. Accident Patterns Accident patterns seen on the collision diagram can often suggest possible accident problems. For example, a large number of angle accidents would imply the potential of a sight distance restriction. At the end of this set of notes is a set of Accident Pattern Tables which identify accident type, possible causes, possible studies to determine the problem, and possible countermeasures. Figures and Tables from Local Highway Safety Studies - User’s Guide, USDOT-FHWA, 1986. Collision Diagrams -3- Permit Writers Workshop Collision Diagrams -4- Permit Writers Workshop Collision Diagrams -5- Permit Writers Workshop Table 1. Accident Pattern Tables Accident Type Overturn Possible Cause • Determine sideslope • Investigate recovery zone • Inadequate shoulder • Determine shoulder dimensions and composition Check for shoulder drop-offs Check for potholes and rutting Check for water ponding Field observation to locate obstructions • Obstruction in or too close to • • • • • Inadequate lighting • Inadequate pavement • Check illumination • Review pavement markings • Inadequate signs, • Review signs, delineators and • Inadequate road design • Check roadside shoulders and • Pavement feature roadway markings Fixed Object Possible Study • Roadside features Safety Enhancement Provide traversable culvert and treatments Extend culverts Install/improve traffic barriers Flatten slopes and ditches Relocate drainage facilities Upgrade shoulder surface Remove curbing/obstructions Widen lane/shoulder Eliminate edge drop-off Improve Superelevation/crown Delineation / reflectorize safety hardware Remove/relocate obstacles Install breakaway features to light poles, sign posts, etc. Protect objects with guardrail Install crash cushions Improve roadway lighting Install reflectorized pavement lines/raised markers Install reflectorized paint and/or reflectors on the fixed object Add special signing Upgrade barrier system Install warning signs/delineators Improve alignment/upgrade Proved proper Superelevation Provide wider lanes Reduce speed limit if justified by spot speed study Provide adequate drainage Improve skid resistance Install warning signs (see MUTCD) Install stop signs (see MUTCD) Install yield signs (see MUTCD) Restrict parking near corners Reduce speed limit if justified by spot speed study Remove sight obstructions Install signals (see MUTCD) Install/improve street lighting Channelize intersections Install signals (see MUTCD) • Restricted sight distance • • • • • • • Large total intersection • Volume count on all approaches • • • • • • • • • • • • • • • • • • • • • Perform spot speed study • Reduce speed limit on approaches if justified by spot speed delineators and guardrails • Slipper surface guardrails maintenance Check Superelevation Perform ball-bank study Check skid resistance Check for adequate drainage Perform spot speed study Field observation for sight obstructions • Check roadway illumination • Perform spot speed study Right-Angle Collisions at Unsignalized Intersections volume • High approach speed • Poor visibility of signals • Review existing signals and placement • Field observation for sight obstructions • Perform spot speed study Right-Angle Collisions at Signalized Intersections • • • • • • • • • • • • • • • • • • Inadequate signal timing • Volume count on all approaches • Review signal timing • • • • • • • • • • • • • • • • study Install rumble strips Install advanced warning devices (see MUTCD) Install visors Install back plates Reduce speed limit on approaches if justified by spot speed study Remove sight obstructions Add additional signal heads Install 12-in. signal lenses (see MUTCD) Improve location of signal heads Install overhead signals Adjust amber phase Provide all-red clearance phases Add multi-dial controller Install signal actuation Retime signals Provide progression through a set of signalized intersections Collision Diagrams -6- Permit Writers Workshop Table 1. Accident Pattern Tables Accident Type Rear-End Collisions at Unsignalized Intersections Possible Cause Possible Study • Review pedestrian signing and • Install/improve signing or marking of pedestrian crosswalks • Driver not aware of • Review signing • Install/improve warning signs • Check skid resistance • Check for adequate drainage • Perform spot speed study • Provide ‘SLIPPERY WHEN WET’ signs • Reduce speed limit on approaches if justified by spot speed intersection • Slippery surface crosswalk marking • Large numbers of turning • Perform turning count • Perform volume count for • Restricted sight distance • Review sight distance • Poor visibility • Check roadway illumination • Review signing • Review pavement markings vehicles through traffic Collisions at Railroad Crossings • Inadequate pavement markings • Rough crossing angle • Sharp angle crossing • Improper pre-emption timing of traffic signals, railroad signals, or gates • Poor visibility or lighting Night-Time Check crossing surface Check crossing angle Review traffic signal timing Review railroad signal and gate timing • Check roadway illumination • • • • • Poor visibility or lighting • Check roadway illumination • Poor sign quality • Review signing • Inadequate channelization or • Review delineation • Slippery pavement channelization/delineation • Check skid resistance Wet Pavement • Inadequate pavement Collisions at driveways Safety Enhancement • Pedestrian crossing markings • Left-turning vehicles • Review pavement markings • Perform turning count • Improperly located driveway • Review driveway placement • Right-turning vehicles • • • • Perform turning counts Review parking Check driveway and lane width Check curb radii • • • • • • • • • • • • • • • • • • • • study Provide adequate drainage Groove pavement Overlay pavement Prohibit turns Increase curb radii Create left- or right-turn lanes Install advance warning signs (see MUTCD) Remove sight obstructions Install train actuated signals (see MUTCD) Install gates (see MUTCD) Reduce grades Increase size of signs Improve roadway lighting Install advance markings to supplement signs Install stop bars Install/improve pavement markings Improve crossing surface Rebuild crossing with proper angle Retime traffic signals Retime railroad signals and gates • • • • • • • • • • • • • • • • • • Install advance warning signs (see MUTCD) Remove sight obstructions Install train actuated signals (see MUTCD) Install gates (see MUTCD) Reduce grades Install/improve warning signs Install/improve delineation/markings Install/improve street lighting Upgrade signing Provide illuminated reflectorized signs Install pavement markings Improve channelization/delineation Provide ‘SLIPPERY WHEN WET’ signs Reduce speed limit if justified by spot speed study Provide adequate drainage Groove existing pavement Overlay existing pavement Install raised/reflectorized pavement markings • • • • • • • • • • • • Install median divider Install two-way left-turn lanes Regulate minimum spacing of driveways Regulate minimum corner clearance Move driveway to side street Install curbing to define driveway location Consolidate adjacent driveways Restrict parking near driveways Increase the width of the driveway Increase curb radii Provide right-turn lanes Widen through lanes Collision Diagrams -7- Permit Writers Workshop Table 1. Accident Pattern Tables Accident Type Possible Cause • Perform volume count for • Large volume of driveway • Perform volume count for • Restricted sight distance • Perform gap study • Field observation for sigh traffic traffic • Inadequate road design Collisions with parked cars or cars being parked driveway traffic • • • • • obstructions Review parking Check roadway illumination Perform spot speed study Check lane width Review angle parking • Perform parking turnover study • Improper pavement • Review pavement markings • • • • • Law observance study Review lane width Check alignment Perform no passing study Check road surface for proper maintenance • Inadequate shoulders • Excessive vehicle speed • Review road shoulders • Perform spot speed study • Inadequate pavement • Review pavement markings markings • Inadequate channelization • Review channelization • Inadequate signing • Review signing and placement • Slippery pavement / ponded • Check skid resistance • Check for adequate drainage • Perform spot speed study • Roadway design inadequate • Check roadside shoulders and water for traffic conditions road maintenance • Check Superelevation • Perform ball-bank study Run-off-road Pedestrian / bicycle through traffic • Large parking turnovers markings • Illegal parking • Inadequate road design and/or maintenance Sideswipe or head-on Possible Study • Large volume of through • Poor delineation • Review pavement markings • Review signs and placement • Poor visibility • Check roadway illumination • Improper channelization • Limited sight distance • Review channelization • Check sight distance • • • • • • • • • • Safety Enhancement Move driveway to side street Construct a local service road Reroute through traffic Signalize driveway Provide acceleration and deceleration lanes Channelize driveway Restrict parking near driveway Reduce speed limit if justified by spot speed study Install/improve street lighting Remove sign obstructions • • • • • • • • • Change from angle to parallel parking Prohibit parking Widen lanes/shoulders Prohibit parking Change from angle to parallel parking Reduce speed limit if justified by spot speed study Create one-way streets Create off-street parking Correct pavement markings • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Enforcement Perform necessary road surface repairs Sign and mark unsafe passing areas Provide roadside delineators Improve alignment/grade Provide wider lanes Provide passing lanes Improve shoulders Reduce speed limit if justified by spot speed study Install median devices Install/improve centerlines, lane lines and edgelines Install reflectorized markers Install/improve channelization Install acceleration and deceleration lanes Provide turning bays Provide advance directions and warning signs Add illuminated name signs Reduce speed limit if justified by spot speed study Provide “SLIPPERY WHEN WET’ signs Provide adequate drainage Groove existing pavement Overlay existing pavement Install/improve traffic barriers Close curb lane Flatten slopes/ditches Relocate islands Improve alignment/grade Provide proper Superelevation Provide escape ramp Widen lanes/shoulders Install roadside delineators Install advance warning signs Improve/install pavement markings Increase sign size Improve roadway lighting Improve channelization Remove sight obstructions Install/improve pedestrian crossing signs and markings Reroute pedestrian paths Collision Diagrams -8- Permit Writers Workshop Table 1. Accident Pattern Tables Accident Type Possible Cause Possible Study • Inadequate protection • Inadequate signals / signs • Inadequate signal phasing • Check existing protection • Review signal/signs • Review signal phasing • Inadequate pavement • Review pavement markings markings • Inadequate lighting • Driver has inadequate warning of frequent midblock crossings • Check roadway illumination • Review existing parking • Perform spot speed study • Lack of crossing opportunity • Perform gap study • Excessive vehicle speed • Perform spot speed study • Pedestrians/bicycles on • Review existence of sidewalks • Long distance to nearest • Check distance and travel time roadway crosswalk • Sidewalk to close to traveled way • School crossing area to nearest crosswalk • Review existing sidewalks • Check pedestrian crossing time • • • and available gaps Check school’s safe route to and from school program Check school’s crossing guard program Check school’s student awareness program Check alignment • Alignment • • Narrow roadway • Review lane width • Review signing • Visibility • Field observation for site • Vertical clearance • Check clearance • Slippery surface (wet/icy) • Check skid resistance • Check for adequate drainage obstruction Bridges • Rough surface • Inadequate barrier system • Field observation and checks against established barrier standards • • • • • • • • • • • • • • • • • • • • • • Safety Enhancement Add pedestrian refuge islands Install/upgrade signals/signs Change timing of pedestrian phase Add pedestrian ‘WALK’ phase Supplement markings with signing Upgrade pavement markings Improve lighting Prohibit parking Install warning signs Reduce speed limit if justified by spot speed study Install pedestrian barriers Install traffic/pedestrian signals Install pedestrian crosswalk and signs Reduce speed limits Install proper warning signs Eliminate roadside obstruction Install curb signs Install sidewalks Install bike lanes/paths Install pedestrian crosswalk Install pedestrian actuated signals Move sidewalk laterally away from roadway • Establish safe route and awareness program • Use school crossing guards • Install crosswalks and traffic signals • • • • • • • • • • • • • • • • • • • • • • • • • Install advance warning signs Improve delineation/markings Realign bridge/roadway Improve delineation/markings Install signing/signals Widen structure Improve delineation/markings Install advance warning signs Remove obstruction Improve delineation/markings Install advance warning signs Provide height restrictor/warning device Rebuild structure/adjust roadway grade Provide special signing Provide adequate drainage Improve skid resistance Resurface deck Rehabilitate joints Resurface deck Regrade approaches Improve delineation/markings Remove hazardous curb Upgrade bridge rail Upgrade bridge approach rail connections Upgrade approach rail/terminals Collision Diagrams -9- Permit Writers Workshop Collision Diagrams - 10 - Permit Writers Workshop Collision Diagrams - 11 - Permit Writers Workshop Deliverable #15 Signal Warrant Analysis Due Friday April 14 • Data Set on Blackboard • 24 hours of 15 minutes counts. You will have to find hourly volumes. Note these hours don't have to start and stop at the top of the hour. • Crash data and document to prepare a crash diagram. One diagram per year of data. • Fill out http://www.wsdot.wa.gov/NR/rdonlyres/8D10BBE2-2D26-4EC9- A114-04F8BADC9B99/0/242014TrafficSignalPermitNEW10510.pdf • Provide data and document to support the need for a traffic signal • This is a legal legacy document and your work should be high quality. No chicken scratches on engineering paper.
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