Why is the m25 the buiest motorway?

The M25 is the busiest motorway in the UK primarily due to its role as a major orbital route around Greater London, connecting numerous key roads and facilitating access to various regions. It serves a high volume of commuter traffic, as many people travel into and out of London for work. Additionally, the motorway supports significant freight transport, contributing to congestion. Its proximity to major airports and commercial hubs further increases traffic levels.