It continues in an easterly direction through Frenchs Forest before eventually terminating at the intersection with Pittwater Road in Dee Why.

191 was declared along this route on 8 August 1928, from Ryde to the intersection with Great Northern Highway (today Pacific Highway at Chatswood);[2] with the passing of the Main Roads (Amendment) Act of 1929[5] to provide for additional declarations of State Highways and Trunk Roads, this was amended to Main Road 191 on 8 April 1929.

Under this act, the A38 retains its declaration as Main Roads 191 (from North Ryde to Chatswood) and 328 (from Roseville to Dee Why), and part of Highway 10 (Pacific Highway from Chatswood to Roseville).

[10] With the conversion to the newer alphanumeric system in 2013, it was truncated back to the interchange of Delhi Road with Hills Motorway, and replaced with route A38.

Upgrades along Wakehurst Parkway would also help to connect the A38 to the proposed Western Harbour Tunnel and Beaches Link.