Police shut the stretch of road between Ballinluig and Dunkeld, Perthshire, while they deal with the ongoing incident.
Meanwhile, a motorcyclist has been taken to hospital following a separate collision on the A93 near Perth Racecourse.
The incident, involving a car, happened at around 8.40am on Saturday, according to police.
No further information was given on the condition of the motorcyclist.
The road was closed, but has since been reopened.