Commuters on the northern beaches will soon be able to throw away their bus timetables after new rapid bus routes to the city take effect, the state government announced on Monday.

A new fleet of 'B-Line' double decker buses will run between Mona Vale and the city centre every 10 minutes from the end of 2017.

An artist's impression shows a new B-Line style bus driving past a new stop at Brookvale. Credit:NSW Government.

The buses will run from about 6am to about 11pm, with services running every five minutes during peak periods.

"This is a landmark day," said Premier Mike Baird unveiling the new routes. "The new buses will be cutting edge in the comfort [they offer] and accessibility and reliability".