The B174 is an urban B-road through the suburbs of Romford. It is considerably shortened from its original length.
Originally the B174 started on the A12 (present A118) in the middle of Romford. It has now been cut back to the bypass (the present route of the A12). The road bears left on meeting the B175 to go through Collier Row and then turns left at a roundabout where it meets the B1459. It continues into open country and ends on the A1112 to the south of Hog Hill.
The A1112 has only existed since the 1970s, however. Until then, the B174 continued north from here, through Chigwell Row, to end on the A113 west of Abridge.