This link to a fascinating and grim video was sent to me by Peter Jacobsen showing what motorists see of crashes using dashboard-mounted cameras. Many of the scenes are motorists crossing the centerline into the path of oncoming vehicles. Peter writes:

“I’m a fan of Vision Zero, and that approach calls for installing raised center medians to prevent a head-on collision. Pretty cheap intervention, but that approach prevents passing slowing vehicles, and hence adds to travel time. Somehow engineers view that as more important… Here in California, Caltrans, the DoT, fought for 20 years against installing a raised median on one “blood alley” (Sears Point Road, part of Highway 37 from Vallejo to Novato).”

https://www.youtube.com/embed/oFkw5JFOmHk