Kuala Lumpur–Karak Expressway

Kuala Lumpur–Karak Highway was originally built in the 1970s by the government of Malaysia as an alternative for the winding, narrow route 68 which runs from Gombak in Kuala Lumpur to Bentong, Pahang. The highway is also a part of route 2. The highway included a 900-metre tunnel at Genting Sempah, which became Malaysia's first highway tunnel ever constructed. It was officially opened in 1979 by Minister of Works and Communications that time Dato Abdul Ghani Gilong.

However, the cost of the construction of this highway was considered as expensive for Malaysia which at that time was an agricultural country. Therefore, the government decided to make Kuala Lumpur–Karak Highway as a toll road to help cover all the construction works. As a result, two toll gates were constructed at Gombak and Bentong and the toll road was administered under Malaysian Highway Authority. The highway was officially opened to traffic in 1977.

Signage indicating approaching exit to Bukit Tinggi, Pahang

The importance of Kuala Lumpur–Karak Highway as the main road from Kuala Lumpur to eastern states of Peninsular Malaysia resulted in the government's decision to upgrade the highway to a multi-lane expressway by duplicating the whole highway stretch at another side. Thus, the former two-lane highway become a dual-carriageway with six lanes (three in each direction) from Kuala Lumpur to Genting Highlands exit and four lanes (two in each direction) for the rest of the expressway.

The upgrading works also included the construction of a second tunnel located beside the existing tunnel to provide additional two lanes for eastbound traffic, widening the toll gates at Gombak and Bentong and also constructing interchanges to replace junctions. However, some junctions were impossible to be upgraded to interchanges due to their geographical locations and therefore some U-turns were constructed to provide entry and exit to the junction for the opposite direction of the expressway. The expressway has two separate carriageway at Genting Sempah in Selangor–Pahang border (one for Selangor side and one for Pahang side) due to their geographical locations. The upgrade works of the expressway was completed in 1997.

MTD Prime held the concession to operate the expressway. The expressway acquired its official route number, E8, at completion, which resulted in overlapping route numbers. As a result, some maps labelled the expressway as E8 and some other maps labelled the expressway as federal route 2.

On 7 April 2011, ANIH Berhad became the concession holder after taking over operations from MTD Prime Sdn Bhd and Metramac Corporation Sdn Bhd.

• 28 January 1990 – 17 people including 11 FRU riot police personal were killed in a collision between Federal Reserve Unit riot police vehicles, a tanker lorry, a passenger bus and 10 cars at kilometre 32.5 of the highway not far from Genting Sempah Tunnel in Gombak, Selangor.
• 11 November 2015 – A landslide has occurred at km 52.4 of the Kuala Lumpur–Karak Expressway between Lentang and Bukit Tinggi, Pahang due to heavy rains. The Lentang–Bukit Tinggi stretch of the expressway was closed to traffic.