Flat Tire

During a road trip, the car tire went flat. The driver took out spare tire and tool box to change the flat tire.

He removed the wheel nuts and kept it safely in the wheel cap. As he was putting back the spare tire, a truck sped fast over the wheel cap causing the nuts to fly away. He searched but it was getting dark and he could not find even a single nut.

His car is still 50 miles away from the city and is getting dark. What should he do?

Photo Adaptation : https://pixabay.com/photos/automobile-car-tire-wheel-rims-818147/