Motor Expo 2026

Motorway Bangyai-Kanchanaburi section Nakhonpathom-Kanchanaburi extends free travel days from 3 PM Friday to 12 PM Monday

The Department of Highways has extended the free-to-use period for the intercity motorway (Motorway) Bangyai-Kanchanaburi (M81) section from Nakhonpathom West checkpoint to Kanchanaburi checkpoint, a distance of 51 km. Previously, it was free every week from Friday at 3:00 PM to Sunday at 9:00 PM. It is now free every Friday from 3:00 PM to Monday at 12:00 PM. Access is only available at Nakhonpathom West checkpoint and Kanchanaburi checkpoint.

In the past, after the trial opening of Motorway M81 Bangyai-Kanchanaburi, it was found to be popular and the volume of usage continuously increased. This reflects the efficiency of the route, which helps shorten travel time to only 30 minutes from the original 1 hour, positively impacting transportation, trade, investment, and tourism in Kanchanaburi province and the western region.

Bangyai-Kanchanaburi extends free travel days for 51 km

- Extended free travel hours every Friday from 3:00 PM to Monday at 12:00 PM, weekly.

- Access is only available at Nakhonpathom West checkpoint and Kanchanaburi checkpoint, effective from today.

Entry-Exit Points

Nakhonpathom West Checkpoint
Point 1, Highway 321 at km. 6+600
- Near Nakhonpathom Provincial Land Transport Office
- Away from Nakhonpathom Rajabhat University

Kanchanaburi Checkpoint
Point 4, Highway 324 at km. 8+400
- Near Ban Huai Talung School, Nong Khao Subdistrict, Tha Muang District, Kanchanaburi Province
- Approximately 3 km from Nong Khao Police Station, Tha Muang District
- Approximately 6 km from Kanchanaburi Technical College

Connected to 8 Major Highway Projects

1. Bangyai Interchange connecting to Special Highway No. 9 and Rattanathibet Road (Highway No. 302)
2. Nakhonchaisri Interchange (Highway No. 3233)
3. Nakhonchaisri Junction Interchange (Special Highway No. 91)
4. Nakhonpathom East Interchange (Highway No. 3036)
5. Nakhonpathom West Interchange (Highway No. 321)
6. Thamaka Interchange (Highway No. 3394)
7. Thamuang Interchange (Highway No. 3081)
8. Kanchanaburi Interchange (Highway No. 324)

Project Route

The route of Intercity Motorway No. 81 Bangyai-Kanchanaburi project, with a total distance of approximately 96 km, starts at the intersection of Special Highway No. 9 (Western Outer Ring Road) and Rattanathibet Road at Bangyai Interchange, Bangyai District, Nonthaburi Province. It then converges with Highway No. 324 (Kanchanaburi-Phanom Thuan Road) in Tha Muang District, Kanchanaburi Province, which is the project's endpoint. Additionally, there is a route branching off from Nakhonchaisri Junction Interchange, connecting to the Nakhonpathom-Cha-am intercity motorway project, which will be constructed in the future for another approximately 9 km. 

** Expected to be fully operational in 2025. For more information, call 1586 (Department of Highways Hotline)

Driving over 80 km/h: Will you get a ticket?

Recently, it became a dramatic issue after some drivers received tickets for exceeding 80 km/h on Motorway M81, and dozens of cars were ticketed for driving faster than the legal limit. Pictures of the tickets were then posted online, showing a speed limit sign of 80 km/h on the ticket. This led to public criticism about whether issuing tickets for vehicles driving over 80 km/h on the motorway for exceeding the legal speed limit was a correct action.

The highway police clarified that Motorway M81 is not yet 100% complete. It is open for use from Nakhonpathom Province to Kanchanaburi Province, a total distance of 51 km. Vehicles driving on Motorway M81 are not allowed to exceed 120 km/h. The issue of detecting vehicles driving over 80 km/h on Motorway M81 is not true.

Even though there are 80 km/h speed limit signs installed on Motorway M81, these signs were installed by the Department of Highways' Safety Promotion Bureau to recommend appropriate speeds, not to detect vehicles driving over 80 km/h as commonly understood. The automatic speed cameras are set to detect vehicles driving over 120 km/h only.

In summary, currently, Motorway M81 does not detect vehicles exceeding 80 km/h, but the speed must not exceed 120 km/h. Otherwise, a ticket will be issued for driving faster than the legal limit.