The road starts at the A21TOTSO at the eastern end of the High Street. It then follows that road's old route over the Comber River and along Newtownards Road to Course Hill, where it ends at a roundabout back on the A21. The dual carriageway from Comber to Newtownards starts here.
The number A211 does not appear on any signs. Heading west the road is simply signposted to the town centre. In other places it is signed as either the A21 or A221 but some maps and official documentation do give the road the A211 number.