Was the firing of Juan Williams racist?
All you need is Pressurerho*g*h, where rho is the density of water, g is gravity, h is 20m Therefore P 1000*9.81*20 P 196200N
Speed bumps are usually painted and are really noticeable no matter what size. They are probably bigger to compensate for the great improvement in suspension. A violent jolt in an old car could become a small bump in a modern car.