The Roads and Maritime Services' Live traffic website is advising motorists to allow extra travel time on both roads as they cope with the extra Good Friday traffic.

Emergency services are currently on the scene of a two-car crash at Bilpin on the Bells Line of Road that is impacting traffic in both directions.

There is heavy traffic in the area and drivers have been urged to exercise caution.

RMS Live Traffic website ...

And drivers on the Great Western Highway are also warned to expect significant delays between Katoomba and Leura, though it is westbound traffic that is most affected as families leave Sydney for the long weekend.

RMS crews are in the area but drivers are warned to allow extra travel time.

Meanwhile, thousands of police have hit the roads across the state as part of an Easter blitz on dangerous driving.

NSW Police operations over the public holidays will be targeting speeding, mobile phone, seatbelt and motorcycle helmet offences.

Double demerits are also in place right across the long weekend.