The B1525 follows the original line of the A16 (now renumbered A1175 in this area) through Market Deeping. It came into being with the opening of the Market Deeping Bypass in July 1998, when the A16 was re-routed.
The road starts at a roundabout on the A15 Market Deeping western bypass, where we also meet the A1175, and heads east into the town centre. We cross the pre-bypass A15 (now the B1524) at a roundabout and then run through the market place before following the River Welland (which is rarely visible) eastwards. It's not long before the road bears left and the B1166 continues at 12 o'clock; some maps claim the entire route so far is actually numbered B1166 and the B1525 starts here but signs disagree.
Having left the river behind we head northeastwards to pass to the north of Deeping St James and then reach open country. The road bears left to cross Deeping Common and ends at a T-junction back on the A1175. Interestingly, the road remained a trunk road until 2001, when it was detrunked by statutory instrument.
