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Federal Route 255
Sultanah Bahiyah Highway
Route information
Length	13.84 km (8.60 mi)
Major junctions
Northeast end	Alor Setar (North) Interchange
Major intersections	K8 Jalan Langgar FT 1 Darul Aman Highway FT 7 Federal Route 7 FT 78 Kuala Kedah Highway FT 1 Sultan Abdul Halim Highway FT 1 Federal Route 1 North–South Expressway Northern Route AH2 North–South Expressway Northern Route
Southeast end	Alor Star (South) Interchange
Location
Country	Malaysia
Primary destinations	Bukit Kayu Hitam Kangar Kuala Kedah Penang Ipoh Kuala Lumpur
Highway system
Highways in Malaysia Expressways Federal State

The Sultanah Bahiyah Highway^[1] (Malay: Lebuhraya Sultanah Bahiyah), Federal Route 255 (formerly Alor Setar Bypass and Jalan Sultanah, both Kedah State Route K139) is a major highway bypass in Alor Star, Kedah, Malaysia.^[2] It was named after the late Sultanah Bahiyah, a first consort of Sultan Abdul Halim of Kedah. The Kilometre Zero is located at Alor Setar North.

In November 2003, after a first consort of Sultan Abdul Halim of Kedah, Sultanah Bahiyah, died on 26 August 2003, the Kedah state government renamed the highway Sultanah Bahiyah Highway in her honour.

In 2013, the highway was gazetted as Federal Route 255.

At most sections, the Federal Route 255 was built under the JKR R5 road standard, with a speed limit of 90 km/h.

This article contains a bulleted list or table of intersections which should be presented in a properly formatted junction table. Please consult this guideline for information on how to create one. Please improve this article if you can. (November 2021)

Km	Exit	Junctions	To	Remarks
FT 255 0	25501 178	Alor Star (North)-NSE Interchange	North–South Expressway Northern Route AH2 North–South Expressway Northern Route North AH2 Hat Yai (Thailand) North–South Expressway Northern Route FT 1 AH2 Bukit Kayu Hitam North–South Expressway Northern Route FT 1 AH2 Jitra South North–South Expressway Northern Route AH2 Kuala Lumpur Penang Bridge Penang	Closed tolled trumpet expressway interchange
Alor Star (North) toll plaza ASU PLUSTransit Touch 'n Go SmartTAG MyRFIDSmartTAG Touch 'n Go RM (Cash) Closed toll system Collect PLUSTransit cards and pay a distance toll
1.3		Alor Setar (North) Toll Plaza	TnG TAG Customer Service Centre
1.4		PLUS PLUS Expressways section maintenances office PROPEL PROPEL section maintenances office	PLUS PLUS Expressways section maintenances office PROPEL PROPEL section maintenances office	Service t-junctions
North–South Expressway Northern Route AH2 North–South Expressway Northern Route Start/end of expressway PLUS Expressways border limit
FT 255 Sultanah Bahiyah Highway JKR border limit
1.6	25502	Jalan Langgar Junctions	K8 Jalan Langgar North FT 175 Langgar FT 175 Pokok Sena FT 1 Jitra FT 175 Kepala Batas FT 175 Sultan Abdul Halim Airport South FT 1 Kota Sarang Semut FT 1 Gurun FT 1 Sungai Petani	Junctions
4.1	25506	Darul Aman Highway Junctions	FT 1 Darul Aman Highway North FT 1 Anak Bukit FT 1 Kepala Batas FT 1 Jitra FT 1 Sultan Abdul Halim Airport South FT 1 City Centre	T-junctions
		Sungai Anak Bukit bridge
		Kampung Pumpong
	25507	Jalan Gangsa Junctions	K137 Jalan Gangsa	Junctions
		Taman Wira Mergong
		Taman Shahab
		Taman Senangin
		Taman Mergong Indah
FT 255 7	25512	Alor Setar Utara Junctions	Northwest FT 7 Kangar FT 7 Kuala Perlis FT 7 Padang Besar Southeast FT 7 City Centre	Junctions
		Sungai Kedah bridge
FT 255 12	25517	Kuala Kedah Highway	FT 78 Kuala Kedah Highway West FT 78 Kuala Kedah FT 78 Kuala Kedah jetty ( Ferry to Langkawi Island) East FT 78 City Centre	Junctions
		Desa Seraya
		Wan Mat Saman Aqueduct Bridge
FT 255 14	25519	Alor Setar Selatan Junctions	North FT 1 Sultan Abdul Halim Highway City Centre South FT 1 Sungai Petani FT 1 Gurun FT 1 Kota Sarang Semut	Junctions
14.6		Tesco Hypermarket Alor Setar
FT 255 Sultanah Bahiyah Highway JKR border limit
Alor Star Welcome Arch
North–South Expressway Northern Route AH2 North–South Expressway Northern Route Start/end of expressway PLUS Expressways border limit
15.3		Alor Star (South) toll plaza	TnG TAG Customer Service Centre|
Alor Star (South) toll plaza ASS RM (Cash) RM (Cash) Touch 'n Go SmartTAG MyRFID Touch 'n Go PLUSTransit PLUSTransit Closed toll system Collect PLUSTransit cards and pay a distance toll
15.6		Railway crossing bridge
FT 255 15.7	25521 177	Alor Star (South)-NSE Interchange	North–South Expressway Northern Route AH2 North–South Expressway Northern Route North AH2 Hat Yai (Thailand) North–South Expressway Northern Route FT 1 AH2 Bukit Kayu Hitam North–South Expressway Northern Route FT 1 AH2 Jitra South North–South Expressway Northern Route AH2 Kuala Lumpur Penang Bridge Penang North–South Expressway Northern Route AH2 Pendang	Closed tolled trumpet expressway interchange

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