The campsites are intended to increase domestic tourism by making it easier for tourists to visit attractions near highways, said Sarawut Songsivilai, the department’s director-general.
Travellers can stay overnight at the 27 campsites for free until April 17.
"Officials at highway divisions are ready to help travellers," he said, adding that drinking water and toilets are available at the campsites.
For more information, contact the department's call centre at 1586.
The locations of the 27 free campsites are:
Chiang Mai
• Mae Taeng Highway Division (Near Huai Nam Dang National Park)
• Chiang Dao Highway Division (Near Chiang Dao Cave)
Chiang Rai
• Mae Lao Highway Division (Near Huai Sai Khao Hot Spring)
Mae Hong Son
• Mae Sariang Highway Division
• Mae Hong Son Highway Division (Near Wat Phrathat Doi Kong Mu)
• Pai Highway Division (Near Wat Nam Hu)
Lampang
• Sop Prab Highway Division
• Hang Chat Highway Division
• Chae Hom Highway Division
Kamphaeng Phet
• Kosamphi Nakhon Highway Division (Near Khlong Wang Chao National Park, Wang Chom Phu Waterfall and Tao Dam Waterfall)
• Khlong Khlung Highway Division
• Khlong Lan Pattana Highway Division (Near Mae Wong National Park and Khlong Lan Waterfall)
• Kamphaeng Phet Highway District (Near Kamphaeng Phet Historical Park)
Sukhothai
• Mae Sin Highway Division
Phitsanulok
• Kaeng Sopha Highway Division (Near Thung Salaeng Luang National Park)
Phetchabun
• Khao Kho Highway Division (Near Khao Kho Royal Palace and Khao Kho Sacrificial Monument)
Tak
• Nong Bua Tai Highway Division
• Mae Salid Highway Division (Near Petrified Wood Forest Park and Bhumibol Dam)
• Tha Song Yang Highway Division (Near Wat Mongkhon Khiri Khet and Mae Moei National Park)
• Khirirat Highway Division (Near Thi Lor Su Waterfall and Doi Hua Mot Viewpoint)
• Umphang Highway Division (Near Lo Su Waterfall, Takobi Cave and Wat Nong Luang)
Kanchanaburi
• Sai Yok Highway Division (Near Sai Yok Noi Waterfall)
• Thong Pha Phum Highway Division (Near Pha Tad Waterfall)
Ratchaburi
• Suan Phueng Highway Division (Near Khao Krachom Mountain, Huai Khok Moo Viewpoint, Khao Sawan Mountain and Huai Nam Sai Village)
Bueng Kan
• Sriwilai Highway Division (Near Phu Thok Mountain, Hin Sam Wan Rock Formation, Chet Si Waterfall and Tham Phra Waterfall)
Loei
• Phu Kradueng Highway Division (Near Phu Kradueng National Park)
• Phu Ruea Highway Division