The New South Wales Government is giving bus passengers a month to prepare for a timetable overhaul, designed to minimise the disruption caused by major construction projects in Sydney's CBD.

The Government has previously warned Sydneysiders to brace for major disruptions when construction of the city's new light rail begins in the CBD in October.

Transport Minister Andrew Constance is urging passengers to start pre-planning their bus trips over the coming weeks, so they are prepared for the introduction of the new timetable on October 4.

Mr Constance said trip planning, timetable and route information was already available online.

"The new bus network will impact nearly all CBD routes," Mr Constance said.

"These are significant changes and that's why I'm asking everyone to start planning now to keep Sydney moving come October.

"This is going to give Sydneysiders a month to be able to plan their new journey to town, particularly during the construction period of light rail and the other 100 projects that are happening around town."

CBD coordinator-general Marg Prendergast said staff in pink shirts and additional signage would also be placed in the city to assist passengers.

"For those needing on-the-ground help when bus routes change, just look for pink," she said.

"We have bright pink signs and staff in pink shirts all around the CBD from Monday 14 September."