– Adding more vehicle lanes to congested roadways
– Converting intersections to roundabouts to help allow free traffic flow
– Interchange layouts to direct traffic to other roads
– Traffic light synchronization
How it Helps
Alternate Forms of Transportation:
Although prioritizing roadway design improvements can greatly enhance traffic flow, these design characteristics should be carefully implemented to ensure that they do not negatively impact users who choose alternative transportation options like biking, walking, or using public transit. For example, increasing the number of lanes on congested roadways can decrease the space available for safe sidewalks, potentially leading to fewer travelers utilizing this transportation mode. Additionally, traffic signal optimization should still include pedestrian crosswalk timing so that these road users can get to their destinations.
Use of Automatic Traffic Management Techniques:
Automated traffic techniques are more effective than manual traffic controls like traffic police officers. Traffic cameras and traffic signals should be employed to take pictures of the traffic volume on the road. IRIS (Intelligent Roadway Information System), which monitors and controls traffic on highways and interstates, is also highly recommended.11
Traffic Management Tools:
Successful urban traffic control involves traffic management plans or traffic control plans, standard operating procedures, temporary traffic management plans, and equipment such as an emergency wand, delineator, traffic cones, cable protector ramps, speed bumps, safety vest, warning signs, and an effective traffic management team.12
In some areas, a lack of familiarity with roadway characteristics can be an impediment to implementing some designs. For example, roundabouts and certain types of interchange designs are not common in some areas of the country, so road users should be well aware of how to navigate these changes.
1) Diverging Diamond Interchange (DDI)
The diverging diamond interchange (DDI) has been gaining popularity in the United States in recent years due to its elimination of left turns and its enhancement of road traffic flow by targeting congestion. A DDI can also incorporate safe pedestrian walkways and crosswalks that involve crossing fewer lanes of traffic.
2) Carnegie Mellon University’s Scalable Urban TRAffic Control Study
Carnegie Mellon’s Scalable Urban TRAffic Control (SURTRAC) is an example of a smart traffic control system designed to optimize traffic signals and improve traffic flow. It utilizes a series of cameras to provide traffic flow information and maintain optimal flow. This technology found a 26% reduction in travel time as well as a 21% reduction in projected vehicle emissions.
3) International Traffic Safety Data and Analysis Group (IRTAD)
International Traffic Safety Data and Analysis Group (IRTAD) is an organization that seeks to promote understanding of road safety on a global scale and help lower the number of traffic fatalities. The International Road Traffic and Accident Database, which provides an empirical foundation for cross-national comparisons and more effective traffic safety regulations, serves as the foundation for its work. It gathers and combines data from around the globe on traffic accidents.