The closure of the Burnley and Domain tunnels could drag into the afternoon peak as CityLink attempts to pinpoint the cause of a computer problem that has thrown Melbourne's traffic into chaos this morning.

Motorists trapped on the city’s clogged roads have reported being stuck in traffic for more than two hours on trips that would usually take them minutes.

Webcams from the Burnley and Domain tunnels this morning, after they were closed to traffic because of a computer glitch.

CityLink has apologised for the fault, the first time it has occurred in the road operator’s 13 years running the toll system.

However five hours after the problem was first reported at 4.30am, CityLink was no closer to discovering the cause of the fault.