# Chaloem Maha Nakhon Expressway

The Chaloem Maha Nakhon Expressway (Thai: ทางพิเศษเฉลิมมหานคร), also known as the First Stage Expressway System (Thai: ระบบทางด่วนขั้นที่ 1), is an expressway in Thailand, located in Bangkok. It is the first expressway to be opened in the country and is 27.1 kilometres in length. The expressway has played an important role in alleviating ground-level road traffic in Bangkok. The expressway is a controlled-access toll road.
Rama IX Bridge, is part of the Tha Ruea–Dao Khanong expressway section.

## History

Due to a significant increase in road traffic in the Bangkok Metropolitan Region, an expressway system was proposed in order to alleviate the heavy ground-level road traffic and in preparation for the predicted increase in car usage. The Expressway Authority of Thailand (EXAT) was tasked to construct Thailand's first expressway in 1978 to connect three main highways leading out of Bangkok to the outlying provinces. This was Vibhavadi Rangsit Road to the north, Debaratna Road to the east and Rama II Road (Thonburi - Pak Tho Road) to the south. A total of 8.51 billion baht was invested in the project, with mainly government funding and some funding from Japan International Cooperation Agency (JICA).
The first section between Din Daeng–Tha Ruea was completed and unofficially opened on 29 October 1981. It was officially opened on 4 January 1982. Its northern end terminated at Vibhavadi Rangsit Road in Din Daeng district and its southern end terminated at Tha Ruea (Port) Junction near Bangkok Port in Khlong Toei district. The second section between Tha Ruea–Bang Na was opened on 17 January 1983 and connected Tha Ruea Junction to Debaratna Road in Bang Na district. The third section between Tha Ruea–Dao Khanong was opened on 5 December 1987 and connected Tha Ruea Junction to Rama II Road in Chom Thong district.
Due to increased road traffic on the expressway, Rama IX Bridge was expanded in 2020 and is expected to be completed in 2023.
According to an official EXAT annual report, the expressway was used by 104,765,797 cars in the 2022 fiscal year, with an average of 302,791 cars per day.
On 15 March 2025, a section of the bridge outbound to Rama II Road was collapsed after concrete beam for new expressway bridge which is still under construction at a time and build on the top of the existing expressway crashing down, which resulted of the bridge section under it fall to the ground.
The collapse ended up with 7 killed, 16 injured and 30 missing as a result. Expressway's car traffic for both inbound and outbound between Rama II Road and Suksawat Road are immediately disrupted from the incident. EXAT announced temporary closure of the section and provide alternative routes until further notices shortly after.

## Route

Kilometre 0 is counted at Din Daeng Interchange.
Chaloem Maha Nakhon Expressway Din Daeng – Tha Ruea :
| Location | km | Northbound | Northbound | Facility | Facility | Southbound | Southbound |
| Location | km | Exit destinations (road) | Toll Plaza (Entry) | English | Thai | Toll Plaza (Entry) | Exit destinations (road) |
| Bangkok | 0.00 | Sutthisan, Don Mueang (Vibhavadi Rangsit Road) | - | Din Daeng Interchange | แยกดินแดง | Din Daeng | - |
| Bangkok | 0.00 | Don Mueang International Airport, Rangsit (Uttaraphimuk Elevated Tollway) | - | Din Daeng Interchange | แยกดินแดง | Din Daeng 1 | - |
| Bangkok | 2.20 | Eastbound - Asok, Phra Ram 9, Suvarnabhumi Airport ( Si Rat Expressway) | - | Makkasan Junction | ต่างระดับมักกะสัน | - | Westbound - Victory Monument, Chaeng Watthana, Dao Khanong ( Si Rat Expressway) |
| Bangkok | 3.70 | Pratunam Intersection, Asok-Phetchaburi Intersection (Phetchaburi Road) | - | Phetchaburi Interchange | แยกทางด่วนเพชรบุรี | Phetchaburi | no exit |
| Bangkok | 4.45 | - | Sukhumvit | Phloen Chit Interchange | แยกทางด่วนเพลินจิต | - | North Phloen Chit, Nana, Asok Montri Intersection ( Sukhumvit Road) |
| Bangkok | 4.45 | - | Sukhumvit | Phloen Chit Interchange | แยกทางด่วนเพลินจิต | - | South Phloen Chit, Lumphini Park (Duang Phithak Road) |
| Bangkok | 6.65 | Lumphini (Rama IV Road) | Phra Ram 4-2 | Phra Ram 4 Interchange | แยกทางด่วนพระราม 4 | Phra Ram 4-1 | Khlong Toei (Rama IV Road) |
| Bangkok | 7.40 | Eastbound - Tha Ruea – Bang Na section | - | Tha Ruea Junction | ต่างระดับท่าเรือ | - | Westbound - Tha Ruea – Dao Khanong section |
| Tha Ruea – Bang Na ||||||||
| Location | km | Eastbound | Eastbound | Facility | Facility | Westbound | Westbound |
| Location | km | Exit destinations (road) | Toll Plaza (Entry) | English | Thai | Toll Plaza (Entry) | Exit destinations (road) |
| Bangkok | 7.40 | Northbound - Din Daeng – Tha Ruea section | - | Tha Ruea Junction | ต่างระดับท่าเรือ | - | Westbound - Tha Ruea – Dao Khanong section |
| Bangkok | 10.75 | Sunlakakorn Intersection (Kasem Rat Road) | Tha Ruea 2 | Tha Ruea Interchange | แยกทางด่วนท่าเรือ | Tha Ruea 1 | Bangkok Port (Kasem Rat Road) |
| Bangkok | 12.30 | At Narong Intersection, Kluai Nam Thai Intersection (At Narong Road) | - | At Narong Interchange | แยกทางด่วนอาจณรงค์ | At Narong | - |
| Bangkok | 14.25 | Eastbound - Suvarnabhumi Airport, Bang Phli, Chonburi ( S1 Expressway) | At Narong 1 (from Chalong Rat) | At Narong Junction | ต่างระดับอาจณรงค์ | At Narong 2 (to Chalong Rat) | Northbound - Khlong Tan, Phra Ram 9, Ram-inthra ( Chalong Rat Expressway) |
| Bangkok | 14.25 | Eastbound - Suvarnabhumi Airport, Bang Phli, Chonburi ( S1 Expressway) | At Narong 1 (from Chalong Rat) | At Narong Junction | ต่างระดับอาจณรงค์ | At Narong 3 | Northbound - Khlong Tan, Phra Ram 9, Ram-inthra ( Chalong Rat Expressway) |
| Bangkok | 15.25 | Bang Chak (Sukhumvit 62 Road) | - | Sukhumvit 62 Interchange | แยกทางด่วนสุขุมวิท 62 | Sukhumvit 62 | - |
| Bangkok | 17.95 | Suvarnabhumi Airport, Bang Phli, Chonburi ( Debaratna Road) | - | Bang Na Interchange | แยกบางนา | Bang Chak (from S1) | - |
| Bangkok | 17.95 | Samrong, Samut Prakan, Chonburi ( Sukhumvit Road) | - | Bang Na Interchange | แยกบางนา | Bang Na | - |
| Tha Ruea – Dao Khanong ||||||||
| Location | km | Eastbound | Eastbound | Facility | Facility | Westbound | Westbound |
| Location | km | Exit destinations (road) | Toll Plaza (Entry) | English | Thai | Toll Plaza (Entry) | Exit destinations (road) |
| Bangkok | 7.40 | Eastbound - Tha Ruea – Bang Na section | - | Tha Ruea Junction | ต่างระดับท่าเรือ | - | Northbound - Din Daeng – Tha Ruea section |
| Bangkok | 10.50 | - | Liap Mae Nam | Mae Nam Interchange | แยกทางด่วนเเม่น้ำ | - | Chong Nonsi, Nang Linchi Road (Rama III Road) |
| Bangkok | 12.60 | Chan Road, Nang Linchi Road (Sathu Pradit Road) | Sathu Pradit 1 | Sathu Pradit Interchange | แยกทางด่วนสาธุประดิษฐ์ | - | - |
| Bangkok | 13.55 | Northbound - Si Lom, Chaeng Watthana ( Si Rat Expressway) | - | Bang Khlo Junction | ต่างระดับบางโคล่ | Sathu Pradit 2 | - |
| Bangkok | 14.97 | Rama IX Bridge | Rama IX Bridge | Rama IX Bridge | Rama IX Bridge | Rama IX Bridge | Rama IX Bridge |
| Bangkok | 16.55 | Bang Pakok (Suk Sawat Road) | Suk Sawat | Suk Sawat Interchange | แยกทางด่วนสุขสวัสดิ์ | - | Phra Pradaeng (Suk Sawat Road) |
| Bangkok | 20.55 | - | Dao Khanong | Dao Khanong Interchange | แยกดาวคะนอง | - | Dao Khanong, Samut Sakhon (Rama II Road) |
| Bangkok | 20.55 | - | Dao Khanong | Dao Khanong Interchange | แยกดาวคะนอง | - | Bang Pakaeo Intersection (Rama II Road) |