The OTP said its study found that vehicles could move on Krung Thon Buri Road at just 6.8 kilometres per hour during the morning rush hour and at 8.6km/h on Phayathai Road during the evening rush hour.
The OTP listed the 10 worst roads for traffic congestion between 6am and 9am as:
1. Krung Thonburi (Krung Thonburi-Surasak) 6.8 km/h
2. Rama IX (Ramkhamhaeng-Rama IX) 7.7 km/h
3. Prachachuen (Pongphet-Chalermphan) 9.3 km/h
4. Inner Ratchavithi (Upai-Victory Monument) 11.5 km/h
5. Borom Ratchanonnee (New Southern Terminal-Borom Ratchanonnee) 11.8 km/h
6. Phaholyothin (Lak Si Monument-Victory Monument) 11.8 km/h
7. Mahaisawan (Mahaisawan-Thanon Tok) 12 km/h
8. Inner Rama IV (Kasemrat- Hua Lamphong) 12 km/h
9. Ratchavithi (Bang Plad-Upai) 12 km/h
10. Lat Phrao (Bang Kapi-Lat Phrao) 12.1 km/h
The 10 most congested roads during the evening rush hours from 4pm to 7pm are:
1. Phayathai (Samyan-Victory Monument) 8.6 km/h
2. Inner Sukhumvit (Nana-Asoke) 9.8 km/h
3. Ratchavithi (Upai-Bang Plad) 9.9 km/h
4. Prachachuen (Chalermphan-Pongphet) 10.6 km/h
5. Charoenkrung (Surawong-Thanon Tok) 10.9 km/h
6. Phaholyothin (Victory Monument-Lak Si Monument) 10.9 km/h
7. Sathorn (Wireless Road-Surasak) 11.6 km/h
8. Rama IX (Rama IX-Ramkhamhaeng) 11.8 km/h
9. Inner Rama IX (Hua Lamphong-Kasemrat) 12.3 km/h
10. Inner Phetchaburi (Urupong-Asoke Phet) 13.1 km/h.