| Country: | MYS |
| Type: | E |
| Route: | 4 |
| Maint: | Rangkaian Lekas Berhad (RLB) |
| Length Km: | 91.0 |
| Direction A: | North |
| Terminus A: | Sungai Petani (North) Interchange |
| Direction B: | South |
| Terminus B: | Bandar Baharu Interchange |
| Destinations: | Sungai Petani Padang Serai Kulim Serdang Bandar Baharu |
| Header Type: | under construction |
South Kedah Expressway (Lekas), or Sungai Petani–Kedah Inner Expressway (SPIKE), is a new expressway under planning in Kedah, Malaysia. "Lekas" stands for "Lebuhraya Kedah Selatan". The South Kedah Expressway is much similar to the North–South Expressway Central Link E6 (Shah Alam–Nilai North) in the Klang Valley. It will act as a bypass from the state of Penang.
| Km | Exit | Interchange | To | Remarks | |
|---|---|---|---|---|---|
| 170 | Sungai Petani North Interchange | West From/to Interchange Sungai Petani Sungai Lalang Baling Merbok Lembah Bujang From/to expressways North–South Expressway Northern Route North Bukit Kayu Hitam Alor Star Gurun South Penang Butterworth Bertam | Trumpet interchange | ||
| 401 | Ambangan Interchange | Jalan Lencongan Timur Ambangan | Trumpet interchange | ||
| 402 | Padang Buloh Interchange | Padang Buloh Baling | Trumpet interchange | ||
| 403 | Lubuk Klab Interchange | WEST Pinang Tunggal Link Pinang Tunggal | Trumpet interchange | ||
| Sungai Muda bridge | |||||
| 404 | Padang Serai Interchange | Padang Serai | Trumpet interchange | ||
| 405 | Kulim North Interchange | West Lekas – BKE Link / Butterworth–Kulim Expressway Butterworth Baling Gerik | Trumpet interchange | ||
| 406 | Kulim Sentral Interchange | Kulim Butterworth | Trumpet interchange | ||
| 407 | Kulim South Interchange | Kulim | Trumpet interchange | ||
| 408 | Terap Interchange | Terap | Trumpet interchange | ||
| 409 | Serdang Interchange | Southest Lekas – Jelas Link Jelas Expressway Lebuhraya Utara–Selatan Lingkaran Tengah/ Serdang Selama Taiping Kuala Kangsar | Trumpet interchange | ||
| 410 153 | Bandar Baharu Interchange | East From/to Interchange Bandar Baharu Parit Buntar Serdang From/to expressways North–South Expressway Northern Route North Penang Butterworth Jawi South Kuala Lumpur Ipoh Alor Pongsu | Trumpet interchange |