Traffic from Nairobi to Nakuru is crazy at the moment. The situation is worse at Kijabe and Gilgil. To avoid this traffic, use the Aberdare Range route to join the main high way at Lanet,Nakuru.
If you follow the Maai Mahiu route, you will also get stuck there because traffic is crazy as well.
Fare from Nairobi to Nakuru has increased to Ksh 1,000