It's not just the suspension system on one's car that takes a pounding from speed bumps (incidentally they used to be called sleeping policemen!).
Where I live there are a proliferation of speed bumps. Recently one of my headlamps failed in the dipped position but then to my surprise a few days later the headlamp on the other side also failed. Both bulbs had gone costing £10.70 each plus VAT!
I am sure that vibration over the speed bumps accelerated the failure of these lights.
I am just waiting for someone to successfully take a local authority to court when it is proved that speed bumps are costing us money by causing items to fail.
I am all for the speed limits being enforced but these measures are quite banal now.