The City of San Diego allows contractors to use steel trench plates on trench projects. Following is the language from city Standard Specifications for Public Works Construction: "Trenches shall be … [Read more...] about Steel plates to cover trenches in construction zones
Materials
Optimal Work Zone Lengths for Two-Lane Highways
Highway pavement maintenance is very expensive not only in terms of costs to the responsible agencies, but also in terms of disruptive delays to users. Construction and maintenance activities on … [Read more...] about Optimal Work Zone Lengths for Two-Lane Highways
Delay Estimation and Optimal Length for Four-Lane Divided Freeway Workzones
Vehicle delay is one of the most serious impacts of highway workzones on existing traffic operations. The present study provides a comprehensive and detailed estimation of traffic delay due to a … [Read more...] about Delay Estimation and Optimal Length for Four-Lane Divided Freeway Workzones
Work Zone Lengths for a Four-Lane Road with an Alternate Route
Highway maintenance, like rehabilitation or resurfacing, on four-lane, two-way highways usually requires closing one or two lanes to set up a work zone. In this paper we evaluate several alternatives … [Read more...] about Work Zone Lengths for a Four-Lane Road with an Alternate Route
Colors of Flagger Safety Vests and Hard Hats
The objective of the study is to determine appropriate recommendations for the UDOT Standards Committee regarding flagger safety vest and hard hat colors. The color of and area occupied by vest … [Read more...] about Colors of Flagger Safety Vests and Hard Hats
Yellow-Green Vests More Visible in Work Zones
A number of studies show that fluorescent yellow-green is the preferred vest color for roadway visibility. Fluorescent orange-red is also an adequate safety garment color, according to this same … [Read more...] about Yellow-Green Vests More Visible in Work Zones