![]() Department of Transportation, University Transportation Centers Program. This document was sponsored by the U.S.The 85th percentile speeds with the MUTCD sign were 1 mph and 2 mph lower than the test sign at the merge sign and taper locations, respectively. The analysis of speed characteristics did not reveal substantial differences between the two sign configurations. Thus, the test sign proved to be a good alternative to the MUTCD sign. In terms of safety, it is desirable for vehicles to occupy the open lane as far upstream from the taper as possible to avoid conflicts due to the lane drop. The test sign had 11% more traffic in the open lane upstream of the merge sign. Occupancy values at different distances between the merge sign and the taper were similar for both signs. The study found that the open lane occupancy upstream of the merge sign was higher for the test sign in comparison to the MUTCD sign. Sign MUTCD Code Conventional Road Expressway Freeway One - Direction Large. ![]() The measurements were taken at two identical work zones on Interstate-70 in Missouri, one with the new test sign and the other with the standard MUTCD sign. The study measured driver behavior characteristics including speeds and open lane occupancies. In this alternative configuration, the graphical lane closed sign from the Manual on Uniform Traffic Control Devices (MUTCD) was compared with a MERGE/arrow sign on one side and a RIGHT LANE CLOSED sign on the other side. This study investigated the effect of an alternative merge sign configuration within a freeway work zone. Guidance: 02 The use of warning signs should be kept to a minimum as the unnecessary use of warning signs tends to breed disrespect for all signs. Investigation of Alternative Work Zone Merging Sign Configurations Section 2C.02 Application of Warning Signs Standard: 01 The use of warning signs shall be based on an engineering study or on engineering judgment.
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