Cicchino, Jessica B.
Insurance Institute for Highway Safety
To estimate the effect on police-reported crash and injury rates of Volvo’s City Safety system, which brakes autonomously at speeds up to 19 mph when a front-to-rear collision is imminent.Methods:
Poisson regression was used to compare police-reported crash involvement rates per insured vehicle year in 27 U.S. states during 2010-2014 between Volvo 2011-2012 model S60 and 2010-2012 model XC60 vehicles with standard City Safety and other luxury midsize SUVs and cars without the system, respectively, controlling for other factors affecting crash risk.Results:
City Safety reduced rates of rear-end striking crash involvements by 41%, rear-end striking crash involvements with injuries by 47%, and rear-end striking crash involvements with third-party injuries by 48%. Additionally, City Safety was associated with reductions of 14% in crash involvement rates, 13% in multi-vehicle crash involvement rates, 12% in injury crash involvement rates, and 8% in third-party injury crash involvement rates. Reductions in rates of all rear-end striking crash involvements, those with injures, and those with third-party injuries were largest at speed limits of 40-45 mph (54%, 65%, and 66%, respectively), followed by speed limits of 35 mph or less (39%, 43%, and 49%, respectively) and of 50 mph or greater (25%, 30%, and 27%, respectively).Conclusions:
City Safety appears to be highly effective at reducing rear-end crashes and associated injuries reported to police, even on roadways with speed limits higher than the system’s operating range.Practical applications:
Nearly one-third of all police-reported crashes are rear-end crashes. If all vehicles on the road in 2013 had been equipped with low-speed AEB that performed similarly to City Safety, approximately 750,000 police-reported rear-end crashes and 350,000 injuries in such crashes could have been prevented that year.