Field evaluation of an Field evaluation of an advanced brake warning advanced brake warning

systemsystem

David ShinarDavid ShinarHuman Factors 1995Human Factors 1995

Presented by: Derrick SmetsPresented by: Derrick Smets

OverviewOverview

With rear end collisions constituting With rear end collisions constituting more than ¼ of all multiple vehicle more than ¼ of all multiple vehicle crashes, new research into crashes, new research into preventative measures is neededpreventative measures is needed

One possible solution is an Advanced One possible solution is an Advanced Brake Warning system (ABW)Brake Warning system (ABW)

This study presents the facts This study presents the facts regarding the Red Alert ABW system regarding the Red Alert ABW system manufactured by Baran Advance manufactured by Baran Advance Technologies in IsrealTechnologies in Isreal

PurposePurpose

PurposePurpose

PurposePurpose

To validate the use of an ABW To validate the use of an ABW system to aid the existing warning system to aid the existing warning systems.systems.– Third Brake LightThird Brake Light

To test the ABW system in different To test the ABW system in different vehicles with different transmissions vehicles with different transmissions (auto and manual) to see if there is a (auto and manual) to see if there is a significant difference in use of the significant difference in use of the ABW system between vehicle typesABW system between vehicle types

BackgroundBackground

For over 25 years researchers have For over 25 years researchers have been developing and testing ideas been developing and testing ideas for ways to prevent traffic accidents for ways to prevent traffic accidents from occurringfrom occurring

Many improvements have been Many improvements have been implemented, such as the high implemented, such as the high mounted third brake light, but there mounted third brake light, but there is still need to further develop ways is still need to further develop ways to prevent accidents from occuringto prevent accidents from occuring

MethodMethod

MethodMethod

6 vehicles were used, 4 cars and 2 6 vehicles were used, 4 cars and 2 truckstrucks– 2 Subaru sedans 1.6L w/ Automatic Trans2 Subaru sedans 1.6L w/ Automatic Trans– 2 Subaru sedans 1.6L w/ Manual Trans2 Subaru sedans 1.6L w/ Manual Trans– 2 Mitsubishi trucks 1.6L w/ Manual Trans2 Mitsubishi trucks 1.6L w/ Manual Trans

Cars were communally used by many Cars were communally used by many drivers who were unaware of the studydrivers who were unaware of the study

MethodMethod

5 things recorded5 things recorded– Total number of braking actionsTotal number of braking actions– Total number of ABW activationsTotal number of ABW activations– Number of braking actions lasting less Number of braking actions lasting less

that 1 secondthat 1 second– Number of ABW activations followed by Number of ABW activations followed by

brakingbraking– Number of ABW activations followed by Number of ABW activations followed by

braking lasting less than 1 secondbraking lasting less than 1 second

ResultsResults

AnalysisAnalysis

Tests were run to determine the Tests were run to determine the significance of parameterssignificance of parameters– Brake applications and short brake Brake applications and short brake

applications were significantly applications were significantly correlated to distance driven (r=0.96 correlated to distance driven (r=0.96 and r=0.89)and r=0.89)

– Abrupt braking and distance where not Abrupt braking and distance where not significantly correlated, due to either significantly correlated, due to either frequency of emergency braking frequency of emergency braking needed, or driving styleneeded, or driving style

ConclusionsConclusions

Over a period of 61,668 km (38319 Over a period of 61,668 km (38319 miles) the false alarm rate of this ABW miles) the false alarm rate of this ABW system was only 4 times per 1000 kmsystem was only 4 times per 1000 km

Compared to the average number of Compared to the average number of times the brakes were pressed for less times the brakes were pressed for less than a second, which was 167 times per than a second, which was 167 times per 1000, this system did not pose a threat 1000, this system did not pose a threat to traffic safety, and could be a big to traffic safety, and could be a big benefit to any following motoristbenefit to any following motorist

FutureFuture

Study with this ABW system to Study with this ABW system to determine if it statistically improves determine if it statistically improves traffic safetytraffic safety

Radar based sensors for detecting Radar based sensors for detecting rapid change in surrounding vehicle rapid change in surrounding vehicle speedspeed– Mercedes new S class – Cruise controlMercedes new S class – Cruise control