I had two friends that were killed in a car crash inside city limits. One guy was turning left, and the other guy going 90 miles an hour in a 40 mile zone. Happened around midnight. Hit them perpendicular, and killed two friends and critically injured driver who survived and is recovering.

Have become much more sensitive about car crashes and speeding as a result obviously. Forces you to re-assess your life.

Realistic solution - Install speeding cameras everywhere, and most intersections. And levy heavy fines if a person is speeding 20 miles above speed limit, possibly even revoking driver's license in that case.