The phrase "a checkpoint at a" is correct and usable in written English.
It can be used when referring to a specific location or point of verification in a process, such as in travel, security, or project management contexts.
Example: "We will establish a checkpoint at a designated area to ensure all vehicles are inspected before entering the facility."
Alternatives: "a verification point at a" or "a control station at a".
An American airman shot and killed a fuel truck driver at a checkpoint at a United States air base "in response to a threat," the military said.
In one project he is working on, the human player is the leader of a squad guarding a checkpoint at a bridge.
According to the United States military, the car approached a checkpoint at a location that an American patrol had cordoned off.
The Israelis reportedly said they would ease the tight restrictions on Palestinians' movements, including relaxing a checkpoint at a refugee camp near Ramallah.
He took the old highway south; he knew that a checkpoint at a small town along the way would not let anyone through.
A visit to one last month was handled like a K.G.B. operation, with a furtive meeting at a bus stop and passage through a checkpoint at a guarded gate.
The use of a riot control agent near a checkpoint at an intersection in the circumstances described is not considered to be a method of warfare".
The Iraqis were quickly driven back to a checkpoint at Kalak, where a highway passes from the government-controlled zone of Iraq to the Kurdish-held north.
One widely circulated this week shows a frightened, shirtless young boy undergoing a pat-down at a checkpoint at the Salt Lake City airport last Friday.
"I've been through security too many times when everyone is talking about their date last night," said Allyn Stewart, a film producer waiting at a checkpoint at Los Angeles International Airport.
It seemed impossible, at a time when fingernail clippers are being confiscated by the hundreds at American airports, that a man could slip past a checkpoint at O'Hare International Airport in Chicago with a bag of knives, Mace and other weapons.
