Lord Shakaka
Refugee
Basically its replacing bridges with one that has the roadway level with the road.
Here are a couple of screenshots I built to solve this problem.

Underside of the bridge is same design of in game current bridges just one block lower and double layer at the start and end of the bridge. Above ground supports are concrete wedge tips, inclines and 1/2 block. Railings are iron railings to protect supports.
I have been able to travel across this bridge multiple times with little to no damage at all done while traveling across with the motorbike and 4x4.
Hope this helps with the annoying problem of fixing bridges all the time.
Here are a couple of screenshots I built to solve this problem.

Underside of the bridge is same design of in game current bridges just one block lower and double layer at the start and end of the bridge. Above ground supports are concrete wedge tips, inclines and 1/2 block. Railings are iron railings to protect supports.
I have been able to travel across this bridge multiple times with little to no damage at all done while traveling across with the motorbike and 4x4.
Hope this helps with the annoying problem of fixing bridges all the time.