Sign Guidance for Zipper Merge
Project Information
Project ID:
FHWA-PROJ-19-0030
Project Abstract:
In typical lane reduction situations, drivers often attempt to merge into the appropriate lane as soon as possible, which can lead to potentially unsafe driving behavior such as slowing too quickly, excessive braking, or dangerous lane changes. Additionally, much of the lane that’s ending remains unused prior to the merge area. Although an early merge may be safe, or even ideal, at lower speeds with lighter traffic flow, a later merge can be beneficial in managing unsafe driving behavior at higher speeds and/or when the traffic flow is heavier.
Although some agencies have reported benefits of signing to promote the zipper merge, no research has been published to date comparing the effectiveness of different variations of zipper merge signs to determine which messages are the most effective. Such research is necessary in order to develop guidance on the use of zipper merge signing.
The objectives of this study are to examine comprehension of signing alternatives; narrow down the signing alternatives; and conduct a field study to examine real-world driver merging behavior in response to zipper merge signs.
Project Status:
Completed
Project Funding Amount (Contract Award Amount):
$301,642.00
Start Date:
End Date:
Public Access Plan:
Yes
Grant/Contract ID:
- 693JJ319F000111
FHWA Program Area:
- Safety
Fiscal Year / AMRP Program / AMRP Activity:
- FY 2002-2022 / Safety / Safety Design and Operations
FHWA Activity:
- Traffic Control Device Pooled Fund
AMRP = Annual Modal Research Plan
Contact Information
Management Organizations
Sponsor Organization
Organization Role:
Sponsor Organization
Organization:
Federal Highway Administration: Office of Research, Development and Technology - Office of Safety and Operations Research and Development
Performing Organization
Organization Role:
Performing Organization
Organization:
Vanasse Hangen Brustlin, Inc.
Deliverables
Links to Project Reports: