While on some recent travel to Runyenjes in Embu, I noticed that traffic slows down substantially on exiting the Nairobi-Nyeri highway to join the one to Meru through Kirinyaga and Embu. Why? On account of road bumps.
This highway has all manner of bumps. Several sections have rumble strips that one can either run over at moderate speed, else tremendously slow down, risking taking hits from the rear traffic.