Traffic engineering

Traffic engineering
Name	Traffic engineering
Activity sector	Civil engineering, Transportation planning
Competencies	Traffic flow, Road safety, Geometric design
Employment field	Government agencies, Consulting firms
Related occupation	Transportation engineering, Urban planning

Traffic engineering. It is a branch of Civil engineering that uses engineering techniques to achieve the safe and efficient movement of people and goods on roadways. The field focuses on the functional aspects of transportation systems, applying principles of Physics and Mathematics to understand and optimize traffic flow. Its practice is closely allied with Transportation planning and is essential for the operation of modern infrastructure in cities like Los Angeles and Tokyo.

Overview

The discipline emerged as a formal field of study in the mid-20th century, significantly influenced by the post-war expansion of automobile ownership in nations like the United States. Professional organizations such as the Institute of Transportation Engineers and the American Society of Civil Engineers establish standards and promote research. Practitioners often work for entities like the Federal Highway Administration or private Consulting firms such as AECOM, addressing challenges from daily Commuting to major events like the Olympic Games. The core objective is to balance capacity, safety, and environmental concerns within the constraints of existing Infrastructure.

Traffic flow theory

This foundational area applies principles from Fluid dynamics and Kinematics to model vehicle movement. Seminal work by researchers like Bruce D. Greenshields established relationships between speed, density, and flow, forming the basis for analyzing Highway capacity. Theories such as the Shockwave model explain phenomena like traffic jams on freeways such as the Interstate 405. Computational tools, including those developed at the Massachusetts Institute of Technology, use these theories to simulate scenarios ranging from a blockage in the Lincoln Tunnel to evacuation routing during Hurricane Katrina.

Traffic control devices

These are the physical elements used to regulate traffic, defined by manuals like the Manual on Uniform Traffic Control Devices. This category includes ubiquitous items like Traffic lights, Stop signs, and Road surface markings. The design and placement of these devices are critical for intersection operation and are standardized by agencies like the Federal Highway Administration. Innovations include adaptive signal systems, such as those deployed in Pittsburgh's Surtrac project, and pedestrian Crosswalk enhancements tested in cities like Copenhagen.

Geometric design

This involves the physical layout and dimensions of roadways, governed by publications like A Policy on Geometric Design of Highways and Streets from the American Association of State Highway and Transportation Officials. It encompasses the design of elements like Vertical curves, Horizontal curves, and Interchange configurations. The design of major projects, such as the Spaghetti Junction in Atlanta or the Autobahn network in Germany, requires careful application of these principles to ensure safety and accommodate vehicles from Compact cars to Semi-trailer trucks.

Traffic safety

A primary goal is to reduce the frequency and severity of Traffic collisions. This involves systematic analysis using methods like the Highway Safety Manual and crash data from sources like the National Highway Traffic Safety Administration. Engineering countermeasures include designing Roundabouts, installing Guard rails, and implementing Traffic calming measures like those used in residential areas of Amsterdam. Research from institutions like the Insurance Institute for Highway Safety continuously evaluates the effectiveness of safety features such as those mandated by the National Traffic and Motor Vehicle Safety Act.

Intelligent transportation systems

This modern subfield integrates advanced Telecommunications and Information technology into transportation infrastructure. It encompasses a wide range of technologies, from Variable-message signs on highways like Interstate 95 to sophisticated Traffic signal preemption for Emergency vehicles. Projects like the ERTICO initiative in Europe and the Smart corridor projects in Singapore utilize data from Inductive loop detectors and Global Positioning System probes to manage networks dynamically, aiming to reduce congestion in metropolitan areas such as London.

Category:Civil engineering Category:Transportation engineering