The controversial WestConnex motorway project has been secretly extended to create an express route from Sydney’s western suburbs to Bondi Beach after researchers found it was the journey most frequently made by “private couriers”, a special Sydney Sentinel investigation can reveal.

The extension, dubbed the “drug super high way”, is described as “key to both ensuring the financial future of one of the biggest industries in Sydney’s west and maintaining Bondi’s iconic nightlife” in leaked documents that outline “world-first” features, including a “white lane” in place of the more traditional bus lane, which will enable couriers to reach clients within 20 minutes of receiving an order for a bag.

Additionally, drivers will be able to insert their E-Toll tag in a bum bag rather than fitting it to a car windscreen.

“We discovered that a number of couriers use rented vehicles in their Eastern run and this bum-tag-bag convenience ensures they can easily switch between a white Lexus or Range Rover,” a spokesperson said, noting that the new road will also benefit the “thousands” of people living in denial about their home address.

“Our research showed that a number of so-called Bondi locals were in fact residents of the western suburbs.”