Unsafe speed was a factor in 35 percent of all fatal collisions Citywide.
As driver speed increases, the field MPH of vision narrows.
Why
Unsafe speed was a factor in 35 percent of all fatal collisions Citywide.
HIT BY A VEHICLE TRAVELING AT:
20
As driver speed increases, the field MPH of vision narrows.
10 %
DEATH RISK
SPEEDING
High Speeds Increase the Likelihood of Collisions Vehicle speed affects a driver’ s peripheral vision. As speed increases, the visual field narrows, limiting the ability of the driver to see other activity on the periphery, such as a person riding a bicycle on the side of the street or a person entering the crosswalk. 5
In addition to limiting the field of vision, higher speeds also increase the distance required for a driver to stop in time to avoid a collision. In general, doubling the speed of a car increases the total braking distance nearly four times. 6 This combination of limited vision and longer braking distance explains why unsafe speed is the most common violation category among all collisions in Los Angeles.
HIT FIELD BY A VEHICLE
OF TRAVELING VISION AT AT::
20 30
MPH
40 10 %
DEATH RISK
HIT BY FIELD A VEHICLE OF
TRAVELING VISION AT AT::
40 30
MPH
40 80 % DEATH RISK
5 Astrid Bartmann, William Spijkers, and Manfred Hess,“ Street Environment, Driving Speed, and Field of Vision,” in Vision in Vehicles III( Evanston, Illinois: Northwestern University, 1991), 381 – 389.
6 Road Safety Authority,“ Stopping distances for cars,” in Rules of the Road( Dublin, Ireland: The O’ Brien Press Ltd, March 2015, 115 – 19, accessed November 3, 2016, http:// www. rotr. ie / Rules _ of _ the _ road. pdf.
VISION ZERO SAFETY STUDY 27