Hard Shoulder
A hard shoulder, also known as a shoulder in American English or a breakdown lane in Australian English, is a crucial component of road safety infrastructure. It is an emergency stopping lane located at the verge on the outer side of a road or motorway. This lane provides a safe area for motorists to pull over in case of an emergency or a vehicle breakdown, thereby ensuring they are out of the main flow of traffic.
Design and Construction
The hard shoulder is typically narrower than a full traffic lane and is constructed with materials such as asphalt, tarmac, or concrete. In some older and rural roadways, these shoulders were initially covered with gravel. Over time, as road construction technologies advanced, these shoulders have been paved to ensure better durability and safety.
In the United Kingdom, motorway shoulders are paved, hence the term "hard shoulders" is used. This distinguishes them from the earlier "soft shoulders," which were not paved and could not support vehicle weight without damage.
Usage
The primary purpose of the hard shoulder is to offer a safe haven for vehicles experiencing difficulties. This can include mechanical breakdowns, tire punctures, or when the driver requires an emergency stop for medical reasons.
Hard Shoulder Running
With advancements in active traffic management, the concept of "hard shoulder running" has been introduced on busy roads. This practice involves allowing traffic to use the hard shoulder as an additional lane during periods of high congestion, thereby enhancing the road's capacity and reducing traffic jams. This is done under regulated conditions, often controlled by overhead variable message signs that dictate when the hard shoulder can be used.
Smart Motorways
The development of smart motorways in the UK has further revolutionized the use of the hard shoulder. These motorways aim to manage traffic flows more efficiently by removing the traditional hard shoulder in some sections. Instead, these roads utilize all available lanes for traffic, incorporating the hard shoulder as a standard lane and introducing emergency refuge areas at intervals.
Safety and Controversies
While the hard shoulder serves an essential safety function, its use for hard shoulder running and in smart motorways has attracted some controversy. Critics argue that converting hard shoulders into traffic lanes can present risks during emergencies, as vehicles may not have a safe place to stop. Proponents, however, highlight the increased road capacity and reduced congestion benefits.