| Country: | MYS |
| Type: | Federal |
| Route: | 255 |
| Alternate Name: | Sultanah Bahiyah Highway |
| Length Km: | 13.84 |
| Direction A: | Northeast |
| Terminus A: | Alor Setar (North) Interchange |
| Junction: | Jalan Langgar Darul Aman Highway Federal Route 7 Kuala Kedah Highway Sultan Abdul Halim Highway Federal Route 1 North–South Expressway Northern Route |
| Direction B: | Southeast |
| Terminus B: | Alor Star (South) Interchange |
| Destinations: | Bukit Kayu Hitam Kangar Kuala Kedah Penang Ipoh Kuala Lumpur |
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.
| Km | Exit | Junctions | To | Remarks | |
|---|---|---|---|---|---|
0 | 25501 178 | Alor Star (North)-NSE Interchange | North–South Expressway Northern Route North Hat Yai (Thailand) Bukit Kayu Hitam Jitra South Kuala Lumpur Penang | Closed tolled trumpet expressway interchange | |
| Alor Star (North) toll plaza ASU PLUSTransit]] MyRFID RM (Cash)]] Closed toll system Collect PLUSTransit cards and pay a distance toll | |||||
| 1.3 | Alor Setar (North) Toll Plaza | ||||
| 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 Start/end of expressway PLUS Expressways border limit | |||||
| Sultanah Bahiyah Highway JKR border limit | |||||
| 1.6 | 25502 | Jalan Langgar Junctions | Jalan Langgar North Langgar Pokok Sena Jitra Kepala Batas Sultan Abdul Halim Airport South Kota Sarang Semut Gurun Sungai Petani | Junctions | |
| 4.1 | 25506 | Darul Aman Highway Junctions | Darul Aman Highway North Anak Bukit Kepala Batas Jitra Sultan Abdul Halim Airport South City Centre | T-junctions | |
| Sungai Anak Bukit bridge | |||||
| Kampung Pumpong | |||||
| 25507 | Jalan Gangsa Junctions | Jalan Gangsa | Junctions | ||
| Taman Wira Mergong | |||||
| Taman Shahab | |||||
| Taman Senangin | |||||
| Taman Mergong Indah | |||||
7 | 25512 | Alor Setar Utara Junctions | Northwest Kangar Kuala Perlis Padang Besar Southeast City Centre | Junctions | |
| Sungai Kedah bridge | |||||
12 | 25517 | Kuala Kedah Highway | Kuala Kedah Highway West Kuala Kedah Kuala Kedah jetty (Ferry to Langkawi Island) East City Centre | Junctions | |
| Desa Seraya | |||||
| Wan Mat Saman Aqueduct Bridge | |||||
14 | 25519 | Alor Setar Selatan Junctions | North Sultan Abdul Halim Highway City Centre South Sungai Petani Gurun Kota Sarang Semut | Junctions | |
| 14.6 | Tesco Hypermarket Alor Setar | ||||
| Sultanah Bahiyah Highway JKR border limit | |||||
| Alor Star Welcome Arch | |||||
| North–South Expressway Northern Route Start/end of expressway PLUS Expressways border limit | |||||
| 15.3 | Alor Star (South) toll plaza | ||||
| Alor Star (South) toll plaza ASS RM (Cash)]] RM (Cash) MyRFID PLUSTransit PLUSTransit Closed toll system Collect PLUSTransit cards and pay a distance toll | |||||
| 15.6 | Railway crossing bridge | ||||
15.7 | 25521 177 | Alor Star (South)-NSE Interchange | North–South Expressway Northern Route North Hat Yai (Thailand) Bukit Kayu Hitam Jitra South Kuala Lumpur Penang Pendang | Closed tolled trumpet expressway interchange | |