Brake Reaction Times (RTs): RTs and drivers’ expectation in hazardous situation

In coll. with

CSR - Centro Studi e Ricerca ing. M. Balestra – Muralto  www.balestra.ch
CANTONE DEL TICINO,  Dipartimento delle Istituzioni Strade più sicure
TCS - Touring Club CH
ACS – Automobil Club CH

Brake Reaction Times (RTs) are important parameters for road safety. Previous research has shown that drivers’ expectations can impact on RTs when facing hazardous situation. The main objective of the present study was to analyze the components of expectations that determine RTs. More specifically the influence of novelty, surprise, coherence and predictability of anticipatory information were analyzed in relation to the RT process. Using an ad hoc advanced driver assistance device, drivers’ expectations were manipulated to create a brake reaction task in real-life driving. Results supply measures and indications on how anticipatory information determines brake reaction times. In particular the effect of misleading warnings slowed visual search for hazard detection, coherent warning quickened the decision making process, while unexpected and surprise events slowed the decision steps before pressing the brake.

Ruscio, D., Ciceri, R., Biassoni, F. (2015). How does a collision warning system shape driver's brake response time? The influence of expectancy and automation complacency on real-life emergency braking. Accident Analysis & Prevention, 02/2015; 77C:72-81

Brake Reaction Times (RTs) Model: