If a city puts its fiber cables underground, it has to close down traffic, pay the cost of digging equipment and endure the risk of unexpected obstacles like a hidden sheet of rock. If it decides to string up the fiber along utility poles, it has a lot of legal maneuvering, negotiations and paperwork ahead of it to secure permission — before it signs on to pay a leasing fee that never goes away. In Stillwater, Okla., and Fauquier County, Va., people are trying a third option. They are, for lack of a better term, gluing it to the ground.“When you think of broadband, the fiber-optic cables are usually up in the air or they’re buried underground,” said Meagan Kascsak, communications coordinator for the city of Stillwater. “This is kind of in between, it’s on a hard surface like a street or a parking lot in this case.”