[3] Many maps including Google Maps label this highway as the Ipoh–Lumut Expressway Sungai Besi–Ulu Klang Elevated Expressway; however, this is incorrect because the Ipoh–Lumut Highway was built as an upgrade of the existing Ipoh–Lumut Road FT5 instead of being a completely new controlled-access expressway route, evidenced by only one grade-separated interchange at Seputeh compared with 34 signalised at-grade intersections along its entire route.

[2] The E19 route number is currently reassigned to the Sungai Besi-Ulu Klang Elevated Expressway (SUKE) in Selangor and Kuala Lumpur.

[2] Initially, the Ipoh–Lumut Expressway was supposed to be built as completely new controlled-access expressway route with the tentative route number of E19, with its construction job being privatised and awarded to SILEX Sdn.

(subsidiary of MRCB) and Perak Corporation Berhad as its main shareholders) as its concessionaire.

[2][7] The Ipoh–Lumut Expressway project was later revived as an upgrade of the existing Ipoh–Lumut Road FT5,[7] consisting a new 22.7-km super two highway route from Seputeh to Jelapang that bypasses the old Jalan Lahat FT5,[2][8] and an upgrade of the 48-km section from Siputeh to Sitiawan to a 4-lane divided highway with partial access control.