Collision Investigation - The use of science

Collision Investigation
Reaction Times
The time a driver would need to react to something prior to the physical
action of braking and/ or steering.
This is the time taken for the driver to identify a hazard, formulate a
response and apply that response. In most cases braking and/or steering
but may be other things.

Collision Investigation
 Reaction time is 1-2 seconds
 This time could be extended due to a number of factors

Factors affecting reaction time
 Fatigue
 Repetitive
 Tedious
 Monotonous
 Nighttime driving
 Rain
 Fog/visibility
 Snow
 Distraction
 Hazard visibility

Highway Code
 Thinking time is 0.67 seconds
 Following studies increased to 1.49 seconds
 Uses distances now instead of time

Driver Factors - Dangerous
distractions
 Mobile phones
 Drink driving
 Drug driving
 Infotainment systems
 In car distractions
 Speed
 Tiredness
 Injury
 Sight impairment

Pedestrian walking speeds
 CCTV of the pedestrian
 Knowledge of the pedestrian’s mannerisms, illness, frailty, walking
speed