2°48′35.2″N 101°54′24″E / 2.809778°N 101.90667°E / 2.809778; 101.90667

Expressway 21
Kajang–Seremban Highway (Lekas Highway)
LEKAS in red
Route information
Maintained by Lebuhraya Kajang-Seremban Sdn. Bhd. (Lekas)
Length	44.3 km (27.5 mi)
Existed	2002–present
History	Completed in 2009
Major junctions
North end	Kajang Perdana Interchange Kajang, Selangor
Major intersections	Kajang Bypass Kajang Dispersal Link Expressway Kajang Dispersal Link Expressway FT 1 Federal Route 1 FT 31 Jalan Banting–Semenyih FT 3265 Jalan Nilai–Pajam FT 86 Federal Route 86 FT 51 Federal Route 51 FT 242 Persiaran Senawang 1
South end	Paroi Interchange Paroi, Negeri Sembilan
Location
Country	Malaysia
Primary destinations	Kuala Lumpur Cheras Kajang Semenyih Pajam Nilai Mantin Temiang Kuala Klawang Seremban City Centre Ampangan Senawang
Highway system
Highways in Malaysia Expressways Federal State

The Kajang–Seremban Highway, KASEH Kajang–Seremban Highway (Malay: Lebuhraya Kajang–Seremban), or LEKAS Highway, is an expressway in Malaysia connecting Kajang, Selangor to Seremban, Negeri Sembilan. The speed limits on the expressway are 80 km/h (50 mph) for the Kajang Perdana–Kajang South and Setul–Paroi sections, and 110 km/h (68 mph) for all other sections.

The 44.3 km (27.5 mi) expressway is designed to pass through Semenyih, Pajam, Mantin, Temiang and link to the Seremban Inner Ring Road. It serves as an effective traffic dispersal for the highly congested Kajang in Selangor to Seremban in Negeri Sembilan besides the North–South Expressway Southern Route and the Kuala Lumpur–Seremban Expressway.

• The highway project has achieved several stages of completion.
• "Package 1A" from the SILK Interchange to Kajang South has been completed and opened to the public.
• "Package 1B" from the Kajang Selatan Interchange to Pajam Interchange, earthworks and major drainage have been completed.
• "Packages 2A and 3" from Pajam Interchange to Paroi, all land acquisitions have been completed. Part of the alignment between Mantin Interchange and Setul Interchange has been approved for realignment.

The Kilometre Zero of the expressway starts right after the Exit 1804 Kajang Perdana Interchange which connects the expressway with the E18 Kajang Dispersal Link Expressway and the Kajang Bypass near Kajang, Selangor.

The project was approved by the government in 1997 and the construction of the expressway began on 2002; however, the financial problems faced by the original concessionnaire, Kajang–Seremban Highway Sdn. Bhd. (Kaseh) had forced the construction works to be delayed. The project was revitalized in November 2006 after a takeover by a new concessionnaire, Lebuhraya Kajang-Seremban Sdn. Bhd. (Lekas), which 50% of the stake was held by IJM Corporation Berhad and the rest of the stake was held by the original concessionnaire, Kajang–Seremban Highway Sdn. Bhd.^[1] This project was scheduled for completion by December 2009.

Phase 1 of the expressway connecting Kajang South to Pajam was officially opened on 23 August 2008. The main subcontractor was WCT, which then subcontracted the beam-manufacturing to Mudajaya. As a normal procedure to allow users to familiarize with the highway, the highway will be toll free for a month from opening.^[2]

The highway system was extended with the opening of Mantin toll plaza on 31 December 2008. Again, the main subcontractor was WCT, and the beam-manufacturer was Mudajaya. Most of the shorter beams like the Ms and Inverted Ts were manufactured at Mudajaya's production plant in Ijok, Selangor, whilst the longer and more "treacherous" I-beams were produced on the site itself. As per normal practice, the route was toll free until 30 January 2009.^[3]

On 1 March 2010, the Setul and Ampangan Interchange opened for traffic.^[4]

• Six-lane carriageway from Kajang to Setul.
• Medium to high speed limits of 80 km/h (Kajang Perdana–Kajang South and Setul–Paroi) and 110 km/h (all other sections).
• A SOS emergency phone.
• The Setul toll plaza is the highest toll plaza in Malaysia located at the hilly top of Gunung Mantin-Seremban at 258 metres above sea level.

On 27 September 2007, at around 11:45 pm, eight massive I-20^{[expand acronym]} beams (each weighing close to 70 tonnes) collapsed at BR 7^{[expand acronym]} (approximately Ch.16,400),^{[expand acronym]} just about a kilometre from the Pajam Interchange. There were no casualties recorded. In the three months following the incident, the contractor constructed a 4 km. public by-pass road circumnavigating the BR 7 launch site,^{[clarification needed]} from the Federal Route FT3265, to the Pajam Interchange, then onto the Pajam Toll Plaza, and coming out again at FT3265 nearer to the town of Nilai, recast the eight I-20 beams, and then re-launched them. There were no public funds involved in the repair work, and all costs were borne by the contractor. The BR 7 is now in service, and is part of the LEKAS Highway.

• 17 April 2010 – Achik Spin (real name Abdillah Murad Md Shari), vocalist of the Malaysian rock band Spin, died in a car accident on the Kajang–Seremban Highway near Pajam, Negeri Sembilan.^[5]
• 3 May 2020 – At around 2:11 am, Koperal Safwan Muhammad Ismail, aged 31, died when he crashed into an Op COVID-19 roadblock near the Kajang Selatan toll plaza.

As part of an initiative to facilitate faster transactions at all toll plazas, all toll transactions on the Kajang–Seremban Highway have been conducted electronically via Touch 'n Go cards or SmartTAGs since 2 March 2016.^[6] This is the first closed toll expressway to phase out the closed toll system.

(Since 1 January 2023)^[7][8][9]

Km	Exit	Interchange	To	Remarks
			North Kajang Bypass Saujana Impian Cheras–Kajang Expressway Cheras-Kajang Expressway Kuala Lumpur Cheras
		Kajang Perdana Interchange	Kajang Dispersal Link Expressway Kajang Dispersial Link Expressway Northeast Kajang Dispersal Link Expressway Sungai Long Kajang Dispersal Link Expressway Balakong Sungai Besi Expressway Sungai Besi Sungai Besi Expressway Seri Kembangan Southwest North–South Expressway Southern Route Kuala Lumpur North–South Expressway Southern Route AH2 Seremban North–South Expressway Southern Route AH2 Johor Bahru South Klang Valley Expressway Putrajaya FT 29 Cyberjaya North–South Expressway Central Link AH2 Kuala Lumpur International Airport (KLIA)	Cloverleaf interchange
Kajang Bypass JKR border limit
Kajang–Seremban Highway Kajang–Seremban Highway Start/End of expressway LEKAS border limit
Kajang–Seremban Highway 0
	2101A 2101B	Kajang South Interchange	2101B Northwest FT 1 Kajang town centre 2101A Southeast FT 1 Rinching FT 1 Semenyih	Full cloverleaf interchange
		Kajang South toll plaza KJS	TnG TAG Customer Service Centre	Kajang bound
Kajang South toll plaza KJS Touch 'n Go SmartTAG MyRFID SmartTAG Touch 'n Go Closed toll system Collect transit card and pay a distance toll
	2102	Semenyih Interchange	FT 31 Semenyih FT 1 Beranang FT 31 Bangi FT 31 Dengkil Setia EcoHill	Trumpet interchange with toll plaza
		Sungai Semenyih bridge
		Sungai Rinching bridge
		Sungai Kembong bridge
	2102A	Eco Majestic Interchange	Eco Majestic FT 1 Beranang	Trumpet interchange with toll plaza
		Sungai Beranang bridge
		Beranang Rest and Service Area (abandoned except surau and toilet)		North bound
		Beranang Rest and Service Area (abandoned except surau and toilet)		South bound
Selangor Darul Ehsan Hulu Langat district border
Selangor-Negeri Sembilan border
Negeri Sembilan Darul Khusus Seremban district border
		Sungai Batang Benar bridge
	2103	Pajam Interchange	FT 3265 Pajam FT 3265 Nilai FT 32 Sepang FT 32 Kuala Lumpur International Airport (KLIA) North–South Expressway Southern Route AH2 North-South Expressway Southern Route Kuala Lumpur Johor Bahru	Trumpet interchange with toll plaza
		Sungai Pajam bridge
	2104	Mantin Interchange MTN	FT 1 Mantin N34 Lenggeng	Trumpet interchange with toll plaza
		Sungai Bangkung bridge 230 m above sea level
Kajang–Seremban Highway --		240 m above sea level
Kajang–Seremban Highway --		250 m above sea level
Setul toll plaza STL 258 m above sea level (Highest toll plaza in Malaysia) Touch 'n Go SmartTAG MyRFID SmartTAG Touch 'n Go Closed toll system Collect transit card and pay a distance toll
		Setul toll plaza STL 258 m above sea level	TnG TAG Customer Service Centre	Paroi bound Highest toll plaza in Malaysia
		Setul viaduct 250 m above sea level
	2105	Setul Interchange 248 m above sea level	FT 1 Seremban town centre FT 1 Temiang FT 53 Port Dickson	Directional-T interchange
Kajang–Seremban Highway --		245 m above sea level		Start/End of six-lane carriageway Start/End of four-lane carriageway
		Sungai Temiang bridge 241 m above sea level
		Ampangan toll plaza AMP	TnG TAG Customer Service Centre	Kajang bound
Ampangan toll plaza APG Touch 'n Go SmartTAG MyRFID SmartTAG Touch 'n Go Opened toll systems Pay toll
Kajang–Seremban Highway --				Start/End of four-lane carriageway Start/End of six-lane carriageway
	2106	Ampangan Interchange	Northeast FT 86 Kuala Klawang (Jelebu) Southwest FT 86 Ampangan FT 86 Seremban town centre FT 53 Port Dickson	Parclo interchange
		Sungai Linggi bridge
Kajang–Seremban Highway --				Start/End of six-lane carriageway Start/End of four-lane carriageway
		Taman Ampangan	Taman Ampangan Taman Bukit Ampangan Taman Margosa	LILO junctions Paroi bound
		Taman Ampangan	Taman Ampangan Taman Bukit Ampangan Taman Margosa	LILO junctions Kajang bound
	2107	Paroi Interchange	West FT 51 Seremban City Centre FT 51 Ampangan FT 51 Paroi East FT 51 Kuala Pilah FT 51 Seri Menanti FT 51 Ulu Bendol Recreational Forest	Multi-level stack interchange
Kajang–Seremban Highway Kajang–Seremban_Highway Start/End of expressway LEKAS border limit
JKR border limit
			South FT 242 Persiaran Senawang 1 FT 242 Senawang FT 1 Rembau North–South Expressway Southern Route AH2 North-South Expressway Southern Route Kuala Lumpur Johor Bahru

• IJM
• LEKAS