Yes discipline should be top but then again, traffic always builds up whenever there's a minor issue such as an accident or bad weather.
But for a road that is probably the 2nd if not the most important in the country, it not being a dual carriageway at least to Nakuru is a travesty. For instance, since the expansion of Waiyaki Way from Rironi, there hasn't been the kind of traffic jams as those which happen consistently in places such as Kimende and Gilgil.
And I know that wider roads ironically lead to more usage and worse jams eg Thika Rd and Houston, TX but a multi approach solution is needed.
