We pay law enforcers for a reason. No one, no where in the world, follows laws because they are inherently good people. They follow the law because there are consequences for breaking them. Do you feel there's consequences for breaking the law in Kenya? I certainly don't. If speed bumps are a solution to you, then prepare for speed bumps every kilometre of the Thika Super Highway.If Kenyans can't be trusted to obey traffic laws, the government should do whatever they have to.
If it's a choice between people speeding and dying/killing others vs the inconvenience of speed bumps, the speed bumps are better.