The vehicle has been taken off the road after it was caught in a blitz by West Midlands Police.
Sandwell's Police Partnership Team tweeted this image of the van, which also appeared to have a wing mirror being kept together with parcel tape.
The official West Midlands Police Twitter account joked that the unusual set up was 'knot acceptable'.
While another Twitter user said: "Wasn't raining. He should have removed the string. How daft can you be?"
While colleagues at the Central Motorway Police group added: "Of all the defects found on numerous dangerous vehicles in Sandwell today, this was the most amusing."
Other vehicles caught up in the blitz included this van:
The vehicles were caught in a day of action with police and other agencies targeting everything from speeding motorists to alcohol licensing issues.