The help stop the spread of Covid-19, New South Wales residents are urged to holiday at home over the Easter long weekend and the April school holidays.

The Federal Government's guidance is to stay at home unless travelling for essential service including food, medical needs or school.

The new 1.3km long Warringah Rd underpass through Frenchs Forest has opened to traffic.

Two lanes are available in each direction, allowing motorists travelling through the area to bypass the busy intersections of Forest Way, Hilmer St and Wakehurst Pkwy.

A speed limit of 60km/h is in place while other work continues in the area.

Access to the Northern Beaches Hospital remains unchanged and is via the surface lanes. Motorists travelling to the hospital will be guided by the blue coloured service signs.