The 'Confined Space' warning sign would be appropriate. A multicolor paint scheme helps as well. I have driven all sizes of car and light/medium trucks safely. There is a myth that mass alone makes a vehicle safe. The design geometry and materials used are crucial to passenger protection. Trucks take longer to stop than a sedan. Most cars and light trucks weigh around 3500 lb. If you are truly worried about crash protection then wear a helmet and knee pads.
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