We should return to the original double-humped design from Compton:

https://libanswers.wustl.edu/faq/76174?ref=contraption.co

Or non-newtonian fluid speedbumps that are soft when hit with light stress and hard when hit with a lot of stress

https://www.jalopnik.com/these-speed-bumps-only-turn-solid-i...

Probably highly temperature dependent or get stabbed with a knife in 2.3 hours depleting its reserve of non-newtonian goo.