Open amcrean opened 5 years ago
http://www.arbitron.com/downloads/InCarStudy2009.pdf?__hstc=161558499.50ca833a108b07688ccc7e8c59111f81.1383061140075.1383061140075.1383061140075.1&__hssc=161558499.1.1383061140075&__hsfp=4111232184
This was for 17% of outdoor advertising and 65% of revenue stat
The above link was actually this - https://www.pennecooutdoor.com/billboard-statistics/ which had the above link as a source