Very Short Duration Work Zone Safety for Maintenance and Other Activities (2019) / Chapter Skim
Currently Skimming:
Pages 12-31
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 12... ...
12 The researchers performed phone surveys to obtain information on current practices and lessons learned related to the selection of TTC methods for planned maintenance activities, specifically focusing on VSDWZs. A structured questionnaire, which can be found in Appendix A, was used for the survey.
|
From page 13... ...
State DOT Practices and Experiences 13 however, most were found to have little or no difference. Only a few states actually use the term "very short duration" in their policies, while others have some type of guidance or decisionmaking tool that includes several factors that could be considered when adjusting the TTC for maintenance work.
|
From page 14... ...
14 Very Short Duration Work Zone Safety for Maintenance and Other Activities and no shadow vehicles are used. A spotter monitors traffic approaching the work area.
|
From page 15... ...
State DOT Practices and Experiences 15 or less by a crew of at least one worker and one truck, in which the hazard of not executing the work as a VSDO is greater than executing it." The memo includes a decision process (flowchart) , potential maintenance activities where the strategy may be useful, and a list of risk factors that could be considered.
|
From page 16... ...
16 Very Short Duration Work Zone Safety for Maintenance and Other Activities Figure 7. TxDOT decision process for VSDO (Chacon 2017)
|
From page 17... ...
State DOT Practices and Experiences 17 this work duration include removing lost cargo or debris, installing or removing traffic control devices, taking a survey shot, providing motorist assistance, and performing quick maintenance or repairs intended as a partial or temporary response to an issue. The policy recognizes that sometimes it may be necessary for workers to walk on a roadway shoulder, cross traffic lanes, or momentarily step into a lane to access work locations or to perform work.
|
From page 18... ...
18 Very Short Duration Work Zone Safety for Maintenance and Other Activities DOT 2011; Virginia Department of Transportation [VDOT]
|
From page 19... ...
State DOT Practices and Experiences 19 If all three of these conditions exist, the supervisor may instruct workers to perform the work on a specified section of highway without a lane closure. All of the following work methods shall be used: (a)
|
From page 20... ...
Table 4. IDOT index guide for work zone case number selection (IDOT 2016)
|
From page 21... ...
State DOT Practices and Experiences 21 TAs for Specific VSD Operations Two states (North Carolina and Massachusetts) have developed TAs for specific work activities.
|
From page 22... ...
22 Very Short Duration Work Zone Safety for Maintenance and Other Activities In response to an incident, the Massachusetts Department of Transportation (MassDOT) developed a TA showing the procedure for moving mowers across a multilane road, shown in Figure 9.
|
From page 23... ...
State DOT Practices and Experiences 23 less than 55 miles per hour and the work must take less than 20 minutes to complete. It is recommended that the supervisor also use devices such as signs, FAS [Flashing Arrow Sign]
|
From page 24... ...
Figure 10. LADOTD decision guide for maintenance traffic control (LADOTD 1979)
|
From page 25... ...
State DOT Practices and Experiences 25 states reported that they would never allow workers to be on the roadway with fewer than three advance warning signs. Others reported an increase in TMA strikes by motorists, despite the availability of adequate sight distance on flat terrain in many cases.
|
From page 26... ...
26 Very Short Duration Work Zone Safety for Maintenance and Other Activities exposure, the ARDVAC was estimated to save $122 per mile when compared with manual pickup methods. In addition, Caltrans has experimented with another litter bag/debris collection vehicle, shown in Figure 12.
|
From page 27... ...
State DOT Practices and Experiences 27 Two states have developed their own debris removal equipment. Missouri DOT (MoDOT)
|
From page 28... ...
28 Very Short Duration Work Zone Safety for Maintenance and Other Activities Figure 15. MoDOT JAWS (Photo courtesy of MoDOT)
|
From page 29... ...
State DOT Practices and Experiences 29 Increasing Visibility of Workers/Work Operation Five state agencies (Caltrans, Georgia DOT, MassDOT, NCDOT, and Utah DOT) reported the use of law enforcement vehicles with flashing lights to perform quick maintenance activities.
|
From page 30... ...
30 Very Short Duration Work Zone Safety for Maintenance and Other Activities rolling terrain and limited sight distance. There was no shoulder and the parked work vehicle was encroaching into the lane when it was struck by a passing motorist.
|
From page 31... ...
State DOT Practices and Experiences 31 states use guidance language to allow exceptions to their lane closure policy. Some states provide decision-making support by way of • Tables for TTC selection by work activity (four states)
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.