The National Academies

NCHRP 15-66 [Completed]

Operational Performance and Safety Effects of Arterial Weaving Sections

  Project Data
Funds: $750,000
Research Agency: University of Florida
Principal Investigator: Lily Elefteriadou
Effective Date: 11/16/2020
Completion Date: 9/15/2023



Arterial roadways are crucial links in the national transportation system. Providing both local and regional mobility and access, they are critical to economic vitality and quality of life in the United States. As drivers place increasing demands on transportation infrastructure and freeway congestion continues to increase, arterials have become an alternative route for many drivers, resulting in the lower performance of these roadways.


In many areas, weaving maneuvers negatively affect arterial operations and safety. For this research, arterial weaving is defined as the crossing of two or more traffic streams in the same direction between two or more access points on a multi-lane urban street with some type of traffic control. Furthermore, weaving maneuvers can affect the operations and safety of many alternative intersection configurations, including median U-turns and restricted crossing U-turns.


Understanding the operational and safety performance of arterials and the effects of weaving thereon is important for transportation agencies tasked with maintaining these roadways. The Highway Capacity Manual, Sixth Edition (HCM), provides a methodological approach for estimating the performance of weaving sections on freeway segments. This methodology, however, is not applicable to arterial weaving due to differences between freeways and arterials in traffic control, traffic flow characteristics, and driver behavior.




The primary objective of this research project was to develop a deterministic method for evaluating the operational performance of weaving sections on arterials. The secondary objective is to identify the safety effects of varying geometric, volume, and traffic control conditions in weaving sections on arterials. 



STATUS: Research is complete; publication decision is pending.  

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