Traffic delays remain on the Western Freeway after an earlier truck fire forced the closure of two lanes and the Legacy Way tunnel.

The clean-up of the truck's load, identified as builder's waste, stretched well into the afternoon, with one of the two previously closed lanes reopening about 3.30pm.

A truck fire at Mount Coot-tha caused traffic delays and closed the Legacy Way tunnel. Credit:Triple M Brisbane - Twitter

A police spokeswoman said the freeway and tunnel should be clear and fully open by 4pm.

However, the Australian Traffic Network said traffic delays remained about two kilometres back down the freeway as the clean-up neared completion.