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- #101
SAE Studies on ABS vs non ABS vs Control
I did some digging around my files and found the SAE papers of the above summary, so that I could confirm some of my bag-o-stats I quote quite often in Vehicle Control Discussions
SAE 1999-01-1288 "Driver Crash Avoidance Behavior with ABS in an Intersection Incursion Scenario on Dry Versus Wet Pavement"
SAE 1999-01-1290 "Driver Crash Avoidance Behavior with ABS in an Intersection Incursion Scenario on the Iowa Driving Simulator"
NHTSB Stats
TO ABS Credit
Fatalities in multivehicle (M-V) accidents
DECREASED 24% in Wet Conditions
Non Fatalities in M-V Accidents
DECREASED 14% in Wet Conditions
That's the best it gets....
The Stats are sobering In Accident Avoidance in Single Vehicle Accidents WITH ABS:
Fatalities in Rollovers INCREASED 51% on Dry Road
Fatalities in Side Impact INCREASED 69% on unfavorable roads
Fatalities in Side Impact INCREASED 61% on favorable roads
Fatalities in Run Off Road INCREASED 29% in Dry
Fatalities in Run Off Road INCREASED by 17% in Wet
The interesting stat in the 1290 Simulator Avoidance Test Study investigating possible causes of the above stats, they found in controlled Accident Avoidance Tests:
23% of Females ran off road during Avoidance with ABS
50% of Females ran off road during Avoidance with non-ABS
(One of the admitted few statistically significant conclusions in the test)
Compared to
40% of Males ran off road during Avoidance with ABS
35% of Males ran off road during Avoidance with non-ABS
These studies and the resulting Final NHTSB report concluded that ABS on wet pavement was good, but could find no correlation to any factor regarding increases in other ABS accidents. It is suggested that having no steering control with conventional brakes may be better.
ABS may give the ability to have more control over *Steering* under braking, the SAE studies don't appear to support many of the positions here that Vehicle Steering wtih ABS VS. Vehicle Control with ABS has a positive correlation in terms of safety.
ST
- Do anti-lock brakes really work?
Anti-lock brakes really do help you stop better. They prevent wheels from locking up and provide the shortest stopping distance on slippery surfaces. But do they really prevent accidents? This is the true measure of the effectiveness of ABS systems.
The Insurance Institute for Highway Safety (IIHS) has conducted several studies trying to determine if cars equipped with ABS are involved in more or fewer fatal accidents. It turns out that in a 1996 study, vehicles equipped with ABS were overall no less likely to be involved in fatal accidents than vehicles without. The study actually stated that although cars with ABS were less likely to be involved in accidents fatal to the occupants of other cars, they are more likely to be involved in accidents fatal to the occupants of the ABS car, especially single-vehicle accidents. There is much speculation about the reason for this. Some people think that drivers of ABS-equipped cars use the ABS incorrectly, either by pumping the brakes or by releasing the brakes when they feel the system pulsing. Some people think that since ABS allows you to steer during a panic stop, more people run off the road and crash.
I did some digging around my files and found the SAE papers of the above summary, so that I could confirm some of my bag-o-stats I quote quite often in Vehicle Control Discussions
SAE 1999-01-1288 "Driver Crash Avoidance Behavior with ABS in an Intersection Incursion Scenario on Dry Versus Wet Pavement"
SAE 1999-01-1290 "Driver Crash Avoidance Behavior with ABS in an Intersection Incursion Scenario on the Iowa Driving Simulator"
NHTSB Stats
TO ABS Credit
Fatalities in multivehicle (M-V) accidents
DECREASED 24% in Wet Conditions
Non Fatalities in M-V Accidents
DECREASED 14% in Wet Conditions
That's the best it gets....
The Stats are sobering In Accident Avoidance in Single Vehicle Accidents WITH ABS:
Fatalities in Rollovers INCREASED 51% on Dry Road
Fatalities in Side Impact INCREASED 69% on unfavorable roads
Fatalities in Side Impact INCREASED 61% on favorable roads
Fatalities in Run Off Road INCREASED 29% in Dry
Fatalities in Run Off Road INCREASED by 17% in Wet
The interesting stat in the 1290 Simulator Avoidance Test Study investigating possible causes of the above stats, they found in controlled Accident Avoidance Tests:
23% of Females ran off road during Avoidance with ABS
50% of Females ran off road during Avoidance with non-ABS
(One of the admitted few statistically significant conclusions in the test)
Compared to
40% of Males ran off road during Avoidance with ABS
35% of Males ran off road during Avoidance with non-ABS
These studies and the resulting Final NHTSB report concluded that ABS on wet pavement was good, but could find no correlation to any factor regarding increases in other ABS accidents. It is suggested that having no steering control with conventional brakes may be better.
ABS may give the ability to have more control over *Steering* under braking, the SAE studies don't appear to support many of the positions here that Vehicle Steering wtih ABS VS. Vehicle Control with ABS has a positive correlation in terms of safety.
ST