Bumps

Bumps in the road may be due to hot/cold weather, heavy traffic, or roots.

But "speed bumps" are where the road level is artificially raised to calm traffic.  They're marked by a white triangle on their leading slope.  They can be individual "cushions", full-width "humps", or "speed tables".

Approaching cushions, line up your seat with the bottom right-hand corner of the white triangle.  This gives you the smoothest ride.

For all types, approach with as much speed as feels comfortable on board and so your tyres stay in contact with the road.