the same follow the friction rule applies to the old interstate system---concrete has the highest friction ratio followed by asphalt then dirt----if you have a normal functioning brake system and drift over the line from the main thoroughfare (concrete) to the asphalt parking lane--left wheels concrete--right wheels asphalt and slam on the brakes---your car will follow the friction and all wheels will be back on the concrete----the same is true with left wheels asphalt and the right wheels on dirt---under full braking the car will climb back up onto the asphalt----that is why the engineers built the interstate system like this....