Stephanie and Dominick Greco opened their train-themed food truck, Get Food Go, at the Halethorpe MARC station on Southwestern Boulevard on Aug. 21.
On Sept. 12, the Maryland State Highway Administration told them they couldn't come back.
Stephanie Greco, a Catonsville native, said an SHA representative told the couple a complaint had been made that their truck's generator was too loud.
After the complaint went through, SHA told Greco and her husband that they did not have the proper permit to be parked along a state-owned road, which Southwestern Boulevard (Route 1) is.
The ruling caught the couple by surprise, since they had obtained a permit from the county they thought allowed them to serve commuters at the station.
"When you look up what you need to run a food truck, it doesn't say a thing about state roads or state permits," Greco said.
David Buck, a spokesman for SHA, said there are two separate types of permits a vendor can get: one from the state, and one from the county.
He said a county permit allows people like the Grecos to park on the side of county road and sell almost anything, from Ravens gear to food.
But only seafood and produce vendors can obtain a permit to sell on a state-owned road.
"The regulations that we have, and this is by law, this isn't something that's just State Highway [Administration], it's only produce and seafood," Buck said.
Those vendors are only allowed on state roads that have a speed limit of 35 mph or less, Buck said.
The speed limit on Southwestern Boulevard at the train station is 40 mph.
"I don't know the reasoning behind the law, we just apply the law," he said.
Because there are no state regulations specifically for food trucks, Buck said Greco and her husband would have to consult with state elected officials for any additions to existing legislation.
"Obviously, food trucks have only been a phenomenon for the past several years," he said. "Cities, where they are more prominent, have had to come up with rules and regulations to govern them.
"It [state law] does not address food trucks," he said. "If they want the law changed, they will have to talk to their officials."
Del. James Malone Jr., who represents the area, said he understood why the state law exists, and also how the Grecos could have been confused about where they were allowed to sell their food.
"I know, being a legislator and being in Annapolis, I knew what it meant," Malone said.
"When she read it to me, I could understand where there could be a misunderstanding," he said. "After I talked with her, what have you, she understood.