Signing, in Combination with Lane Markings, in Advance of Lane-Reduction Transitions

Marchese, Matthew; Gonzalez, Tracy B. · 2022 · ROSA P / United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology

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Summary

This study, conducted under the Traffic Control Device (TCD) Pooled Fund Study, addresses the persistent safety and operational challenges associated with roadway lane-reduction transitions. The research was motivated by evidence suggesting that standard lane-reduction signing, particularly the W4-2 symbol, suffers from low driver comprehension rates, leading to inconsistent merging behavior. The primary objective was to quantify driver behavior—specifically recognition of lane termination, preparation for lane changes, and execution of merges—when exposed to various combinations of advance warning signs and lane line transition markings. The study aimed to determine if specific sign and marking configurations could improve driver understanding and promote safer, earlier merging maneuvers. The researchers employed a controlled experimental design using virtual "fly-through" videos generated from geographic information system data to simulate driving on four-lane, undivided highways at 45 mph. One hundred twelve licensed drivers, stratified by age (under and over 45) and gender, participated in the study. Participants viewed stimuli from two perspectives: the terminating right lane and the adjacent through left lane. The experimental variables included two types of lane transition markings (dotted lines versus dotted lines with a solid white line) and 16 sign configurations comprising standard MUTCD-compliant signs (W4-2, W9-2, W9-1) and non-compliant alternatives (W20-X3, W9-2L-DE, W4-2-PI). Participants used a three-button response pad to indicate when they recognized the lane ended, when they prepared to change lanes, and when they executed the lane change. Data were analyzed using generalized estimating equation models to assess the impact of these variables on response times. The results indicated that the inclusion of advance warning signs significantly influenced driver behavior, resulting in earlier recognition of lane termination compared to configurations without advance signage. Furthermore, the type of pavement marking affected merge timing; specifically, dotted-with-solid-white lane line transition markings led to earlier lane changes than dotted lines alone. The study found that drivers responded more proactively when provided with redundant cues through both advance signing and specific pavement markings. The analysis also examined interactions between sign types and marking styles, confirming that the combination of devices played a critical role in shaping driver response times and merge locations. The findings suggest that integrating advance warning signs with specific lane line transition markings can enhance driver comprehension and promote earlier, safer merging behavior at lane-reduction transitions. The study supports the use of dotted-with-solid-white markings to encourage timely lane changes and highlights the value of advance signage in improving recognition of upcoming roadway changes. These results provide empirical evidence for updating the Manual on Uniform Traffic Control Devices (MUTCD) and offer guidance for state departments of transportation seeking to implement more effective traffic control devices. By clarifying the synergistic effects of signing and markings, the research contributes to improved roadway safety and operational efficiency at lane-reduction sites.

Key finding

The inclusion of advance warning signs resulted in earlier recognition of lane termination, and dotted-with-solid-white lane line transition markings resulted in earlier lane changes.

Methodology

simulator

Sample size: 112

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).

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

Topics

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• signage environment
• perceptual countermeasures
• signaling behavior

Information type

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• Empirical Findings: behavioral performance data