Details:

Creators:
Lammers, Erin ; Pigman, Jerry G. ; Howell, Brian ; Kirk, Adam
Lammers, Erin ; Pigman, Jerry G. ; Howell, Brian ; Kirk, Adam Less -
Corporate Creators:
University of Kentucky Transportation Center
Corporate Contributors:
Kentucky. Transportation Cabinet
Subject/TRT Terms:
[+]
Early Merge Highway Safety Late Dynamic Merge Merge Merging Area Merging Traffic Traffic Safety Work Zones Work Zone Traffic Control Zipper Merge
Publication/ Report Number:
KTC-17-27/SPR16-526-1F
Resource Type:
Tech Report
Geographical Coverage:
Kentucky ; United States
Kentucky ; United States Less -
Corporate Publisher:
University of Kentucky Transportation Center
Abstract:
In an effort to improve work zone safety and streamline traffic flows, a number of state transportation agencies (STAs) have experimented with the zipper merge. The zipper merge differs from a conventional, or early, merge in that vehicles do not merge into the lane that remains open immediately after being notified of a lane closure. Rather, vehicles continue to occupy all lanes until they reach the taper, at which point — and directed by signage — vehicles take turns merging into the open lane, creating a zipper pattern. At the request of the Kentucky Transportation Cabinet (KYTC), Kentucky Transportation Center (KTC) researchers reviewed the performance of the zipper merge as documented in case studies from other states and analyzed two instances of the zipper merge being implemented in Kentucky. Previous studies found zipper merges are optimal on roadways with heavy traffic, whereas the conventional merge is preferable for uncongested and low-volume roadways. The case studies used a blend of quantitative and qualitative, observational data; researchers investigated the performance of zipper merges installed on Interstate 275’s Carroll Copper Bridge and KY 9’s Taylor Southgate Bridge. For the I-275 bridge, KTC researchers were able to compare the early merge configuration to the zipper merge. Here, the zipper merge brought about minor, although statistically insignificant, improvements in traffic flow and roadway safety. Analysis of the zipper merge on the Taylor Southgate Bridge relied more heavily on qualitative data, as the zipper merge was installed from the outset of the study and no comparison to an early merge could be made. The zipper merge appeared to improve traffic flow, reduce backups, and minimize the area impacted by construction. While neither case study offers definitive evidence that the zipper merge is significantly more effective than the early merge, they offer limited support for its use. On this basis, researchers suggest its continued implementation on other KYTC projects. Implementing the zipper merge elsewhere in Kentucky will enable further data collection and potentially identify locations and situations for which the zipper merge is the most appropriate merging method.
Format:
PDF
Funding:
SPR 16-526
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:e834d20fb577aade62921940c3f71d74fa668db3d435e9d195d6b595ba3255b3
Download URL:
https://rosap.ntl.bts.gov/view/dot/35694/dot_35694_DS1.pdf
File Type:

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