The B667 follows the original line of the A46 through Thurmaston, to the north of Leicester. The road seems to have gained its number in the 1960s when the A46 was moved onto the bypass before the latter road was diverted along the bypass. The A46 has since been moved again and the Thurmaston bypass is now numbered A607. The B667 is shown as unclassified on some maps but Leicestershire County Council do give the road its number in official documents.
The B667 starts at traffic lights at the southern end of the A607 bypass and heads north along Melton Road, which is largely residential but does have a few shops and other buildings. The shops become more numerous as we reach the village centre and pass the church. The houses become more suburban as we continue on. A dead-end residential side road is accessed via a mini-roundabout and then we end at a full-size roundabout shortly afterwards, back on the A607.