Collision Diagrams Logic Table

This article shows the logic table of Collision Diagrams for each direction.

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Written by Gentry White
Updated over a week ago

This article outlines the logic used to plot crashes in the Collision Diagrams application. The diagram below represents a 4 leg intersection, with regions assigned an alphabetical designation. The Region column of each table indicates where the icon for the crash would be located in the intersection diagram.

The logic tables are broken into four categories, one for each direction of travel for vehicle 1 (Northbound, Southbound, Eastbound, and Westbound).

For more information on the Collision Diagrams application, see the Collision Diagrams - App Overview article.

## Vehicle 1 Westbound

(The Region columns below dictate where the mapped vehicle's direction and maneuver will fall on the chart above).

## Northbound

 V1 Direction V1 Maneuver V2 Direction V2 Maneuver Type First Harmful Event Region Icon NB Straight -- -- Single Vehicle -- L NB Straight WB Straight Angle -- E NB Straight EB Straight Angle -- I NB Turning Left SB Straight Angle, L - Same Route -- D NB Turning Left WB Straight Angle, L - Different Route -- E NB Turning Left EB Straight Angle, L - Different Route -- I NB Turning Right SB Turning Left Angle, R - Same Route -- J NB Turning Right EB Straight Angle, R - Different Route -- J NB Straight NB Straight Front to Rear -- L NB Straight NB Slowing, Stopped in Traffic Front to Rear -- L NB Straight SB Straight Front to Front -- I NB Straight/Entering Traffic Lane/Overtaking/Passing NB Straight/Slowing/Stopped in Traffic Sideswipe, Same Direction -- L NB Straight/Entering Traffic Lane/Overtaking/Passing SB Straight/Slowing/Stopped in Traffic Sideswipe, Opposite Direction -- I NB Straight -- -- Single Vehicle Animal/Bike/Ped Involved I NB Turning Left -- -- Single Vehicle Animal/Bike/Ped Involved C NB Turning Right -- -- Single Vehicle Animal/Bike/Ped Involved J

## Eastbound

 V1 Direction V1 Maneuver V2 Direction V2 Maneuver Type First Harmful Event Region Icon EB Straight -- -- Single Vehicle -- G EB Straight NB Straight Angle -- I EB Straight SB Straight Angle -- H EB Turning Left WB Straight Angle, L - Same Route -- E EB Turning Left NB Straight Angle, L - Different Route -- I EB Turning Left SB Straight Angle, L - Different Route -- H EB Turning Right WB Turning Left Angle, R - Same Route -- K EB Turning Right SB Straight Angle, R - Different Route -- K EB Straight EB Straight Front to Rear -- G EB Straight EB Slowing, Stopped in Traffic Front to Rear -- G EB Straight WB Straight Front to Front -- H EB Straight/Entering Traffic Lane/Overtaking/Passing EB Straight/Slowing/Stopped in Traffic Sideswipe, Same Direction -- G EB Straight/Entering Traffic Lane/Overtaking/Passing WB Straight/Slowing/Stopped in Traffic Sideswipe, Opposite Direction -- H EB Straight -- -- Single Vehicle Animal/Bike/Ped Involved G EB Turning Left -- -- Single Vehicle Animal/Bike/Ped Involved K EB Turning Right -- -- Single Vehicle Animal/Bike/Ped Involved B

## Southbound

 V1 Direction V1 Maneuver V2 Direction V2 Maneuver Type First Harmful Event Region Icon SB Straight -- -- Single Vehicle -- A SB Straight EB Straight Angle -- H SB Straight WB Straight Angle -- D SB Turning Left NB Straight Angle, L - Same Route -- I SB Turning Left EB Straight Angle, L - Different Route -- H SB Turning Left WB Straight Angle, L - Different Route -- D SB Turning Right NB Turning LefT Angle, R - Same Route -- C SB Turning Right WB Straight Angle, R - Different Route -- C SB Straight SB Straight Front to Rear -- A SB Straight SB Slowing, Stopped in Traffic Front to Rear -- A SB Straight NB Straight Front to Front -- D SB Straight/Entering Traffic Lane/Overtaking/Passing SB Straight/Slowing/Stopped in Traffic Sideswipe, Same Direction -- A SB Straight/Entering Traffic Lane/Overtaking/Passing NB Straight/Slowing/Stopped in Traffic Sideswipe, Opposite Direction -- D SB Straight -- -- Single Vehicle Animal/Bike/Ped Involved A SB Turning Left -- -- Single Vehicle Animal/Bike/Ped Involved I SB Turning Right -- -- Single Vehicle Animal/Bike/Ped Involved C

## Westbound

 V1 Direction V1 Maneuver V2 Direction V2 Maneuver Type First Harmful Event Region Icon WB Straight -- -- Single Vehicle -- F WB Straight SB Straight Angle -- D WB Straight NB Straight Angle -- E WB Turning Left EB Straight Angle, L - Same Route -- H WB Turning Left SB Straight Angle, L - Different Route -- D WB Turning Left NB Straight Angle, L - Different Route -- E WB Turning Right EB Turning Left Angle, R - Same Route -- B WB Turning Right NB Straight Angle, R - Different Route -- B WB Straight WB Straight Front to Rear -- F WB Straight WB Slowing, Stopped in Traffic Front to Rear -- F WB Straight EB Straight Front to Front -- E WB Straight/Entering Traffic Lane/Overtaking/Passing WB Straight/Slowing/Stopped in Traffic Sideswipe, Same Direction -- F WB Straight/Entering Traffic Lane/Overtaking/Passing EB Straight/Slowing/Stopped in Traffic Sideswipe, Opposite Direction -- E WB Straight -- -- Single Vehicle Animal/Bike/Ped Involved F WB Turning Left -- -- Single Vehicle Animal/Bike/Ped Involved K WB Turning Right -- -- Single Vehicle Animal/Bike/Ped Involved B
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