Like your experience, here in Kenya they really have an every man for himself attitude to driving (Like many other places no doubt). When you are on a bike you are at the bottom of the food chain and your side of the road belongs to anyone else coming the other way if they are bigger than you. Riding in African cities isn't generally a pleasant experience IMHO, you have to ride with the belief that everyone is out to kill you (Especially the Matatu's). Many people just pay some chai money for their license so the driving ability suffers as a consequence. The other hazard is the Police as they are the most corrupt people in the country and will find any excuse to shake you down and they aren't as easy going here as many other countries in Africa and have no problem putting people in if they don't pay up. I have found people are more easy going further south; Tanzania, Zambia, Malawi etc.