The phrase "route has been" is correct and usable in written English.
For example, you might use it to explain a change of plans: "Our route has been altered due to roadwork on the interstate."
"The rest of the route has been confirmed".
This route has been sorely diminished over the years.
So far the second route has been taken, but the referendum blocks much further travel.
The route has been steadily improved, the roughest sections graded, and in some cases sealed.
"The parade route has been set for a while, and nothing had changed".
Delivering vaccines by the oral route has been the holy grail of vaccinologists for decades.
A new bus route has been planned to ensure that they get to school.
A huge amount of communication to Londoners, particularly those along and near the route, has been undertaken," he said.
"As far as I know, this route has been used for trekking for more than 20 years," Jingmei said.
Now a new route has been submitted.
An efficient synthetic route has been developed for this molecule.
