Considering the amount of traction a bicycle tire has on gravel, I hope that they also have side air bags!
That's why you'll have to buy a hybrid bike. Yes, there are such things. They are a cross between a road and an off-road bike. Fatter tires and marginally more comfortable than the a road bike. Good for mild off-roading but gotta keep pedaling on pavement because of the fatter tires.
Hey, it'll keep us in shape.