To ride over metal bridge gratings, you should:

Riding over rain grooves or bridge gratings may cause a motorcycle to weave. This is generally not dangerous, so you should simply relax and proceed straight across any such grooves or gratings at a steady speed. Trying to compensate for the weave by riding in a zigzag pattern is dangerous.

Wait, before you go

Ace Your Pennsylvania Motorcycle Written Test with our Guaranteed Cheat Sheet