Multiple car crashes and a bus fire created peak-hour chaos on Canberra's roads Tuesday morning.
The five incidents marred the start of National Road Safety Week as workers faced numerous traffic delays including a gridlock near the Glenloch interchange.
An ACTION bus caught fire on Caswell Drive, north of William Hovell Drive, about 7.40am, blocking one northbound lane.
An Emergency Services Agency spokesman said the fire was sparked by a mechanical fault, leaking oil onto the road. Firefighters sprayed the flames with foam.
The spokesman said there were no passengers on board and no-one was injured.
Caswell Drive traffic was further delayed from about 8am after a three-car collision near the Aranda exit.
An ACT Policing spokeswoman said the crash closed one southbound lane, however all three cars were moved off the road by 8.25am.
A second three-car crash further north added to the congestion from about 8.20am.
The police spokeswoman said the collision on Gungahlin Drive, about 100m north of Ginninderra Drive towards the Barton Highway, blocked one lane of southbound traffic.
Two cars were moved off the road fairly quickly, however, a third car stuck on Ginninderra Drive delayed traffic until about 9am when it was towed.
The ESA spokesman said paramedics were called to the crash site but no-one was seriously injured or taken to hospital.
Over in Crace a van and a car collided on Abena Avenue just after 8.30am, holding up residents trying to leave the suburb.
An ACT Policing spokesman said the white van was stuck on the road for some time before it was towed off the road by about 9am.
Meanwhile, a another crash on the Tuggeranong Parkway about 8.45am forced Canberra drivers to remain alert.
An ACT Policing spokesman said two cars were stuck in a dangerous position in the left northbound lane, near Lady Denman Drive.
The northbound lane was blocked, delaying the last of the peak hour traffic until the cars were towed and the road full opened about 9.45am.
Police urged drivers to slow down, concentrate and leave a safe distance between the car in front of them.