1. Highway 85, Saudi Arabia - The Undisputed Champion (822 km/510 mi) Taking the crown for the world's longest straight road is Highway 85 in Saudi Arabia. This mammoth highway stretches an ...

In the UK, the largest ring road is undoubtedly the M25, which spans the 117-mile journey around London. When it first opened in 1985, it was considered to be the longest ring road in the world ...