This article is about the current B3173 in Windsor.
For the former B3173 in Seaton, Devon, see B3173 (Devon)
The B3173 is a short link road in Windsor. It was originally unclassified but had gained its number by 1975, presumably at the same time as the A332 Windsor bypass was built.
The road starts at a light-controlled junction with the B3022, from where it runs north-north-east along the full length of Imperial Road to end at a large signalized roundabout where it meets the A308, the A332, and the B3024.