Advertising billboard size 5×6 m. up to 5×8 M. which located in 63 locations in heart of city nationwide. 

Central 15 locations 

Traveler 24,478,436 people
Population 17,018,869 people

Bangkok (3)
Phitsanulok (1)
Phra Nakhon Si Ayutthaya (3) 
Nakhon Sawan (2)
Nakhon Pathom (1)
Saraburi (1)
Suphan Buri (1)
Kamphaeng Phet (1)
Chai Nat (1)
Sukhothai (1)

Eastern 6 locations  

Traveler 9,597,995 people
Population 4,744,000 people

Chon Buri (4)
Chanthaburi (1)
Prachin Buri (1)
 

Northeastern 15 Locations 

Traveler 10,860,721 people
Population 21,989,477 people

Nakhon Ratchasima (3)
Ubon Ratchathani (4)
Udon Thani (1)
Maha Sarakham (1)
Buri Ram (1)
Roi Et (1)
Sakon Nakhon (1)
Chaiyaphum (1)
Kalasin (1)
Surin (1)

Northern 9 Locations

Traveler 9,880,035 people
Population 12,098,164 people

Chiang Mai (3)
Chiang Rai (3)
Lampang (1)
Uttaradit (1)
Phayao (1)

Southern 14 Locations 

Traveler 15,408,662 people
Population 9,399,578 people

Songkhla (4)
Nakhon Si Thammarat (2)
Surat Thani (2)
Phuket (1)
Trang (1)
Phatthalung (1) 
Chumphon (1)
Phangnga (1)
Ranong (1)

Western 4 Locations

Traveler 7,433,598 people
Population 3,381,719 people

Kanchanaburi (1)
Ratchaburi (1)
Prachuap Khiri Khan (2)

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References:
Travelers statistic of Jan-Mar 2018; Ministry of tourism & sports
Population of 2017; National statistical office