The businessman, who operates Kamwana Pork City and other butcheries in Embu and Thika towns, was driving with a friend from Majimbo area on the outskirts of the town.
The Businessman known as Geoffrey Mwangi managed to steer the Toyota Land Cruiser Prado for about a kilometre as he bled.
The man is now fighting for his life at the Aga Khan Hospital in Nairobi, where he was transferred from the Embu Referral Hospital after the incident on the Embu-Kiritiri road.
Traders condemned the attack and called on the police to investigate the shooting.
“We want to know those who attacked our colleagues and the reasons behind it,” Mr Kanyi Maina said.