The A40 is a major road in the United Kingdom that runs from London to Fishguard in Wales. It covers approximately 256 miles and serves as an important route for both local and long-distance traffic. The road passes through several towns and cities, including Oxford and Aberystwyth, providing access to various attractions and services along the way. Originally designated as a trunk road, the A40 has undergone several upgrades and improvements over the years. It is part of the European route E30, connecting the UK to other parts of Europe. The road is crucial for trade and travel, linking key regions and facilitating economic activity.