|Distance:||16.3 miles (26.2 km)|
|Meets:||A803, B8080, B8028, B8022, A73, B802, B804, A89|
|Route outline (key)|
The B803 is a long B-road in the Central Belt of Scotland.
It starts on the A803 (former A9) gyratory in Falkirk town centre. It heads south, with the left lane of the dual-carriageway to the next roundabout being purely for car park access. It bears right to a mini-roundabout where it meets the B8080 and is the dominant number in a brief multiplex to the east. The two roads go their separate ways at the next mini-roundabout, after which the road climbs to the south to reach traffic lights. Ahead is the B8028 and the B803 TOTSOs right.
The road soon goes over the Glasgow - Falkirk - Edinburgh railway line by Falkirk High Station and continues west, soon reaching open country. It then crosses the valley to the south before detouring to the west to avoid Darnrig Moss. After crossing the River Avon the village of Slamannan is reached with a T-junction on the High Street. To the left is the B8022 whilst the B803 TOTSOs right.
The road now runs west for a few miles along a narrow, albeit fairly flat and straight, road before reaching a roundabout on the A73. There is a short multiplex south to the next roundabout where the B803 regains its number and westerly direction. The road quickly reaches Glenmavis where there is another multiplex with the B802 between two mini-roundabouts, although here it is uncertain which number is dominant. The road now descends through the fields to reach Coatbridge.
The road soon meets the B804 and there is a short multiplex to the left between adjacent mini-roundabouts where the road crosses over the North Clyde Line before the B803 continues west to a T-junction by Sunnyside station. It TOTSOs left here and ends shortly afterwards at a roundabout on the A89 (former A8).