Curves constrain use of vehicle automation
Adaptive cruise control and more sophisticated partial automation are as much as 75 percent less likely to be active on freeway curves, limiting their potential safety benefits.
Crash rates rise in states with legal marijuana
New research from IIHS and HLDI confirms the trend, but a separate study of injured drivers found no increase in crash risk from the drug except when combined with alcohol.
The case for helmet laws
As states have loosened and strengthened motorcycle helmet laws, evidence has mounted in favor of universal helmet requirements.
