The singer Ellie Goulding came to the rescue of a motorist stuck in a car being pushed sideways by a Royal Mail lorry down one of London’s busiest roads.

Footage circulating on social media shows a Volkswagen GTi being pushed down Western Avenue – the A40 – by the vehicle with other cars honking their horns to get the attention of the truck driver.

Eventually, the lorry driver stops with motorists shouting at him and appears astonished to see the car in front of his truck, claiming he did not see it, or know it was there. He can be heard yelling: “I didn’t see him, I honestly didn’t see him.”

Facebook Twitter Pinterest Ellie Goulding’s Instagram post about the collision. Photograph: Ellie Goulding Instagram

He later tells the driver of the car: “Let’s pull over and I can explain.”

Goulding revealed on Instagram that her driver, Guy, was one of the motorists who stopped to help, with Ellie herself checking on the driver to see if he was OK.

She told her 14.4 million followers: “On a side note, I can’t believe the first instinct of the other drivers who got out was to instantly start filming on their phones and shout abuse at the poor shocked driver, not even checking the other driver was okay. What on earth.”

A Royal Mail spokesman said: “We are very concerned about this incident. We sincerely hope that no one was hurt. We are investigating as a matter of urgency.”

The Metropolitan police said a routine patrol car came across the crash at 10am, close to the Greenford roundabout. A spokesman said: “There were no reported injuries. Officers spoke with both parties. No arrests were made.”