A study by Purdue University states that safety systems like ABS and airbags make drivers less vigilant. Fred Mannering, the professor of civil engineering at the university who led the study, brought his team to the water of five years of motor vehicle crashes in Washington State. The students began studying the collisions beginning in 1992, as that was about when airbags and ABS began to be introduced rapidly into the mainstream auto market.
Anti-lock braking systems have come under some mild scrutiny as of late. Frank Williams, a frequent contributor to The Truth About Cars, recently wrote an article detailing the inherent problems with ABS in passenger vehicles, saying that overall they may do more harm than good and that NHTSA should look into its own findings to address the matter.