Cars could be made very stong so that they do not bend very much in a crash . The cars would stop very suddenly when they crash. The passenger would decelerate very fast and be badly injured. modern cars have crumple zones. The metal bends and buckles in a crash. However motorcyclist need protection for their body because they don’t have a passenger cage and crumple zone. They need to wear leather trousers, a leather jacketaleatheboots.