I once heard a certain urban planner say many of Kenya's small towns (and most of African countries) are designed by truck drivers. It initially did not make sense but every time I travel upcountry, I fully appreciate the statement.
If for instance a couple of truck drivers decide Kikopey (on your way to Nakuru) has the most delectable meat, word will spread and they will start stopping there en masse. Before long, more eateries come up, someone else opens a bar and cheap lodgings and voila, a new town comes into being.