The phrase "a roadside office" is correct and usable in written English.
It can be used to describe an office or workspace located near a road, often for convenience or accessibility.
Example: "The company set up a roadside office to better serve travelers and provide quick assistance."
Alternatives: "a roadside location" or "a roadside facility".
We became friends as I passed the lodge to and from Anse Source d'Argent, and her roadside office encouraged easy conversation.
The blast damaged a roadside market and nearby government offices.
— Sandwiched between two doctors' offices at a roadside plaza here is the headquarters of a small team of veteran Republican investigators, operating almost as a private detective squad, who since late last year have had a determined goal: bringing down Senator Robert Menendez, Democrat of New Jersey.
Next to an imposing government office building, at a roadside stand selling soda and toys, Lin waddles over to dust off her children, two boys ages 5 and 2, and a 3-year-old girl.
Built in 1987 on 19 acres, the Brookhaven Executive Center was originally called Strathmore Office Park under a different owner and has for the past 15 years been identified by a roadside sign that simply reads: "Brookhaven Town Offices".
It happened fast, out of the spotlight, on a roadside in southern Mexico: President Vicente Fox used the power of his office to try to change a life.
Sept. 7, 2005: Four American contractors employed with a private security firm supporting the regional U.S. embassy office in Basra, Iraq, were killed when a roadside bomb exploded near their convoy.
A roadside bomb exploded behind a vehicle that was taking the governor, Juma Khan Hamdard, to his office, said Rohallah Samon, a spokesman for the governor.
The official, Hajji Musa Rasoli, the provincial police chief in Nimroz, in southwestern Afghanistan, was driving back to his office from a visit with his family in Herat Province when his vehicle hit a roadside bomb.
In Mosul, a policeman was killed by a roadside bomb, the head of a local government district was killed by a group of gunmen outside city offices, another roadside bomb killed two Iraqi soldiers, an unidentified sniper shot and killed a policeman, gunmen killed two people, and an insurgent and an Iraqi Army soldier were killed in a shootout at a checkpoint, according to police accounts.
