Route 302 is 17.808 kilometres (11.065 mi) long, of which 15.12 kilometres (9.40 mi) is in Nonthaburi, and 2.688 kilometres (1.670 mi) is in Bangkok.[1]
Ngam Wong Wan Road (Thai: ถนนงามวงศ์วาน) continues east from Rattanathibet Road at Khae Rai intersection in Nonthaburi, crossing into Bangkok at Lak Si District, then passing through Chatuchak District, ending at Kaset intersection, where it intersects with Phahonyothin Road. Via a bypass tunnel beneath Kasetsart, the road continues as Prasoet Manukit Road (Thailand Route 351).
Ngam Wong Wan Road is named for Damrong Ngamwongwan (Thai: ดำรง งามวงศ์วาน), a Department of Highways engineer who oversaw construction of the road. It was a policy of the Plaek Phibunsongkhram government that new roads be named for their chief engineers.