Benefits of Managed Motorways

Introduction

The managed motorway system is a comprehensive traffic management approach that leverages advanced technology tools such as cameras, sensors, structural road designs, and transportation data to effectively regulate motorway traffic. These tools provide valuable information instrumental in controlling and optimizing traffic flow.

Over recent years, motorway traffic worldwide has shown consistent growth, with the UK, for example, reporting an annual increase of approximately 1.5 per cent. Although factors like high fuel prices and economic challenges may influence the growth rate, motorways will likely continue to see expansion in the years to come. Particularly in Europe, motorways have been experiencing increasing congestion, causing commuter delays. Efforts have been made to enhance the capacity of existing road networks, including innovative strategies like converting hard shoulders into active running lanes, as highlighted in Paul Unwin's research paper, "From ATM to Managed Motorways: Delivering Operational Benefits to Road Users through Innovative Technology Solutions."

For many decades, the use of hard shoulders has been discouraged by traffic authorities primarily due to safety concerns and the significant risks they pose. Analysts argue that it is imperative to introduce safer and more innovative approaches to manage the ever-growing traffic without incurring excessive costs. In the UK, hard shoulders were introduced in 1959 and have since been considered a standard feature to address vehicle breakdowns and motorway reliability issues. However, in recent times, this conventional approach has been questioned in favour of cutting-edge technologies that offer improved traffic control and environmental benefits.

Managed Motorways; Developments So Far

In this section, our focus shifts to a range of Managed Motorways projects, aiming to explore how forward-thinking and enhanced technology utilization can lead to significant time and resource savings (Noland and Quddus, 2005). These projects have introduced fresh standards to enhance the reliability and efficiency of motorways, prioritizing safety and overall user benefits.

Figure 1: Motorway Cameras installed to give live coverage to the management team

• M-25 Controlled Motorway (1998---2002); Mother of Managed Motorways concept

The inception of Controlled Motorways dates back to 1998, when it was introduced as a solution to manage the continuously expanding traffic on the M25. The Traffic Agency adopted a strategy of installing speed frameworks and lane signalling every 1000 meters, effectively controlling traffic speeds and minimizing stop-and-start patterns.

This approach not only led to a significant reduction in traffic disruptions but also witnessed a noteworthy increase in overall capacity. Following the successful implementation of this scheme, it yielded impressive outcomes, as documented by Unwin and Marsh in 2009. Notably, there was a 15 per cent decrease in personal injury accidents. These compelling results prompted calls for further development of the concept to address traffic and congestion challenges nationwide.

• M-42 Active Traffic Management Pilot

The M-42 Active Traffic Management Pilot, known as ATM Pilot, played a pivotal role in reshaping government policies regarding traffic control. As the 1990s drew to a close, Traffic Agencies began recognizing the paramount importance of optimizing existing infrastructure rather than resorting to costly widening methods that offered diminishing returns and posed significant challenges to the public and the environment.

Widening schemes, particularly, had gained notoriety due to the complications they introduced during road construction, impacting the general public and traffic management. In pursuit of an effective and efficient solution to congestion and safety concerns, the innovative concept of the M-42 ATM Pilot was introduced. It marked a historic departure, permitting drivers in the UK to utilize the hard shoulder as an additional running lane. The project proved a groundbreaking initiative, effectively alleviating traffic congestion during peak hours along the M-42 route.

Like the M-25 Managed Motorways, the ATM Pilot implemented gantries spaced at approximately 500 meters to oversee and regulate vehicle speeds. The framework was thoughtfully designed to enhance the visibility of road signs and signals, enabling road users to readily adhere to established rules and regulations (Unwin and Marsh, 2009). Following the project's implementation, it became evident that the success of Managed Motorway Schemes is substantially influenced by driver behaviour, in addition to speed control. Consequently, the timely and clear communication of instructions to drivers is imperative to ensure they are not left in doubt regarding the appropriate course of action.

Managed Motorways in Future; Looking Ahead

The UK Transport Secretary has allocated a substantial £6 billion in funding to enhance the existing motorway network nationwide. Valuable insights gained from successfully implementing the M-42 ATM Pilot and M-25 MM projects will serve as foundational principles for future road improvement initiatives.

• Operational Hurdles

The achievement of success in the M-42 ATM pilot project was the result of effectively surmounting numerous operational and technical challenges. International standards and best practices were diligently employed to ensure the development process's reliability and safety.

Notably, the technology behind message signs and signals was initially unproven, necessitating significant work to establish its reliability and successful operation. The primary objectives of the scheme centred on providing safer and more efficient road networks while maximizing the use of existing land.

The key factors contributing to this success encompassed:

1. Challenging established standards to yield superior results.
2. Enhancing driver safety.
3. Effective stakeholder management.
4. A design process that prioritized operational efficiency.
5. Design considerations for ease of maintenance.

Crucially, these success factors cannot be incorporated into the design process without thoroughly understanding the project's specific objectives and requirements (Unwin and Marsh, 2009). It is essential to comprehensively grasp the objectives before finalizing the operational approach, with design engineers and their teams typically assuming responsibility for considering all facets of the process to achieve the desired outcomes for their clients.

Figure 2: Motorway Management Team Office and Data Centre