Strategies for Interim Use of Managed Lanes

Carson, Jodi L · 2005 · ROSA P / Texas. Department of Transportation

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Summary

This report addresses the lack of formal policies and guidelines for the interim use of managed lanes, such as High-Occupancy Vehicle (HOV) or High-Occupancy Toll (HOT) lanes. While these facilities are designed for standard operational procedures to manage traffic flow, specific conditions—including construction, special events, major incidents, and large-scale emergencies—may necessitate their temporary opening to general-purpose traffic or use as staging areas. The research was motivated by the variability in observed national practices, the absence of standardized criteria for such decisions, and limited understanding of the associated benefits and concerns, such as impacts on public acceptance, safety, and regulatory integrity. The study aims to identify positive procedural trends, assess potential benefits and drawbacks, and develop comprehensive guidelines to inform the *Managed Lanes Manual* for the Texas Department of Transportation (TxDOT) and the Federal Highway Administration (FHWA). The methodology involved a comprehensive review of published literature, current research, and national practices. Researchers utilized databases such as Transportation Research Information Services (TRIS) and the Transportation Research Board’s Research in Progress (RIP) to identify relevant studies, though direct literature on interim managed lane use was scarce. Consequently, the study relied on indirect sources regarding vehicle-specific strategies, construction management, and special event planning. Additionally, the researchers analyzed national practices through prior surveys and agency websites, focusing on how various jurisdictions handle the diversion of general traffic into HOV lanes during incidents or emergencies. This synthesis of literature and observed practices formed the basis for evaluating operational, safety, and public perception considerations. The findings categorize motivating conditions into planned events (construction, special events) and unplanned events (major incidents, emergencies). The report identifies that interim use strategies primarily involve suspending time-of-day, vehicle occupancy, or toll restrictions to alleviate general-purpose traffic demand or provide staging areas for emergency resources. Key considerations include operational impacts on congestion and enforcement compliance, safety design standards, and the potential for political volatility if managed lane users perceive a compromise in their level of service. The study highlights that current decision-making often relies on the judgment of on-scene law enforcement officers without defined criteria, leading to inconsistent practices. Based on these findings, the report provides recommended interim use practices structured around planning, criteria, and implementation. It advises agencies to conduct transportation system assessments, review policies, and establish inter-agency coordination agreements prior to interim use. Specific criteria for opening managed lanes are recommended based on the severity and nature of the condition, time-of-day, anticipated duration, traffic impacts, and the availability of alternative facilities. Implementation requirements include clear on-site signing, network traffic management, public education, and monitoring and evaluation. These guidelines aim to ensure that interim use decisions are systematic, minimizing negative impacts on facility performance and public trust while maximizing network efficiency during exceptional circumstances.

Key finding

Formal policies for interim managed lane use were not uncovered, and observed practices were highly variable and dependent on on-scene judgment rather than well-defined criteria.

Methodology

review

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

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