The Preston By-pass was constructed as a solution to the growing traffic congestion in and around the city of Preston, Lancashire. By the mid-1950s, the post-war boom in car ownership led to increased demand for efficient road infrastructure. Designed by Sir Peter G. H. C. Lee and his team, the motorway aimed to provide a seamless movement for vehicles and reduce the burden on local roads. Opening to traffic on this date marked a turning point in the UK's approach to road construction, showcasing the shift towards dedicated pathways for vehicular traffic.

This pioneering stretch of road spanned approximately 8.2 miles and was carefully engineered to support a faster traffic flow, complete with privacy from adjacent developments. The design included features like overpasses and underpasses to minimize disruptions at cross streets. Celebrated by the government, the opening of the motorway heralded a new era in road transport, emphasizing the importance of connectivity and efficiency.

As part of the M6 and M55 motorways, the Preston By-pass not only facilitated local journeys but also played a key role in long-distance travel across the North West and beyond. The motorway's successful implementation laid the groundwork for the subsequent extensive motorway network throughout the country, demonstrating how modern transportation infrastructure could keep pace with the changing needs of society. Furthermore, the concept of the motorway influenced global road transport systems, leading other countries to adopt similar models.