The fire department spent five to 10 minutes stabilizing the car, which rotated and ended up on its side at 1 p.m.
"One of our officers who is an EMT crawled in with them originally," Bock said.
The passenger, who was an elderly man, was flown by helicopter, while the female driver was being evaluated at Waynesboro Hospital.
Officials called for three helicopters for the accidents, but the pedestrian stayed at Waynesboro Hospital.
Bock was unsure whether driver error or a car malfunction caused the Impala to accelerate onto Main Street at the start of its 40-foot eastbound journey before the drop. A guardrail and fence border the wall.
Police did not release the names of the victims of Monday's accidents.
Rescue squads from Waynesboro and Blue Ridge Summit, Pa., were assisting at the scene of Monday's accidents. Three Waynesboro police officers were called out of training, so the seven scheduled officers were divided between the two crashes.
On May 1, Joseph Stewart, 93, of Foulger Street, Waynesboro, was fatally struck by a pickup truck on South Potomac Street near Gay Street. Lester E. Malone, 82, of Chambersburg, Pa., was killed 11 days later when he was hit by a vehicle while walking near the intersection of Lincoln Way East and Fourth Street in Chambersburg.
The Borough of Waynesboro had gone nearly seven years without a pedestrian fatality until a 65-year-old woman was killed last September, according to published reports.