Rural Fire Service, Fire & Rescue NSW and other emergency services are attending a car fire on the M1 Motorway at Maddens Plains.
One of three southbound lanes is closed as firefighters distinguish the blaze that started in the car on the motorway around 7.10pm.
No is trapped and motorists are advised by Live Traffic NSW to reduce speed and exercise caution.
Meanwhile traffic is still heavy northbound on the M1 Princes Mwy at Waterfall where queues have been as long as 15km as people head home after the long weekend.
Transport NSW advises motorists heading north to Sydney to expect significant delays in the heavy traffic conditions.