The US finally takes aim at truck bloat

This week, the US National Highway Traffic Safety Administration (NHTSA) stunned safety advocates by proposing new vehicle rules that it says will help reduce pedestrian deaths in America. The new rules appear aimed directly at the trend of increasingly massive SUVs and trucks, which have been shown to be more deadly to pedestrians than smaller and midsize vehicles.

Never in its 50-plus years in existence has the regulator issued new rules...