THE second day back from school holidays is proving a nightmare for Brisbane commuters, with a perfect storm of traffic incidents causing gridlock.

Following an earlier accident on the Pacific Motorway southbound at Greenslopes, a breakdown at Woolloongabba has caused further headaches, with traffic banked up along the Riverside Expressway and Coronation Drive to Toowong.

Delays are back to TOOWONG on CORO DRV due to the crash on the M3 at GREENSLOPES. Associated approaches also affected. #qldtraffic pic.twitter.com/5HPgdyxi5A — QLDTrafficMetro (@QLDTrafficMetro) July 11, 2017

Further south, a crash on the Pacific Motorway at Eight Miles Plains caused delays just after 2pm.

Around the same time a broken-down cement truck closed a southbound lane of the Gateway Motorway at Bracken Ridge.

Congestion creeping back to WOOLLOONGABBA on the M3 due to the crash prior to exit 8 at Greenslopes heading south. Expect delays #qldtraffic pic.twitter.com/UpTRxDvot4 — QLDTrafficMetro (@QLDTrafficMetro) July 11, 2017

It was also a slow run on the Western Freeway from Mt Coot-tha through to Kenmore.

Commuters have also been warned to expect delays on the M1 with traffic congestion from Shailer Park to Palm Beach on the Gold Coast.

There are also extensive delays around the Brisbane CBD, with congestion on Milton Rd inbound.