That is exactly it. Toll plazas tend to be lightning magnets since they are usually the only structure for miles around. These days they are also stuffed with electronics so grounding and surge protection is very important.
I was also surprised at how bad the traffic pounds the roadway. Ductbanks are 4x4 foot solid reinforced concrete and 5 or 6 feet below the roadbed. I did MM99 on Fla I-75 and it was an education.
Ever notice the blast of cold air at a toll booth? They use 100% fresh air makeup in the booth, sucking fresh air from the other side of the plaza buildings.
