What is a key feature of a dynamic smart motorway?

A key feature of a dynamic smart motorway is the use of adjustable traffic lanes that vary in usage based on congestion. This system allows for the optimization of traffic flow by changing the designation of lanes based on real-time traffic conditions. For instance, additional lanes can be opened up to manage heavier traffic loads, or lanes may be closed during lighter periods to improve safety or facilitate roadworks. The dynamic nature of these lanes helps to alleviate congestion and improve travel times, which is central to the design and functionality of smart motorways.

In contrast, features like constant speed limits throughout the day do not accommodate the variability of traffic conditions that dynamic smart motorways are designed to manage. Hard shoulders that are always available for stopping do not reflect the purpose of dynamic smart motorways, where the hard shoulder may be utilized as an additional lane during peak traffic times. Lastly, while emergency services are an important aspect of highway management, exclusive access at all times may not be a practical feature of dynamic systems that need versatile lane usage based on current traffic conditions.