Qiánmiàn shì zhǔgàndào, zuǒbiān nà tiáo shì zhīlù.
The main road is up ahead; that one on the left is a branch road.
Tips
usage
支路 contrasts with 主路 (zhǔlù, 'main road') in traffic contexts and with 干路 (gànlù, 'trunk circuit') in electronics. The image is the same: a 'branch' coming off a trunk, whether of asphalt or wire.
grammar
Used with the measure word 条 (tiáo) for the road sense - 一条支路 'one side road' - because 条 covers long, narrow things (roads, rivers, snakes).
