In-Service Performance of Traffic Barriers (2003) / Chapter Skim
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Pages 31-41
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31 CHAPTER 3 DATA COLLECTION AREAS This chapter describes the characteristics of three data collection areas where in-service evaluation data was collected beginning in July 1997, including the types of hardware on the road system, the historical collision data, police procedures, and maintenance procedures. Data collectors were informed about possible cases by police and maintenance agencies in each area.
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32 about collisions. Police collision reports were obtained as soon as they were released, but since this could be as much as 3 months after the collision, it was often difficult to match police reports with specific damaged installations.
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33 repairs the barrier, the reference number on the sticker can be used to identify the responsible party. DOT maintenance supervisors routinely monitor the roadside hardware in their areas of responsibility.
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34 barriers and terminals in each data collection area based on the quantities indicated by the inventory on each type of roadway. As shown in Table 6, 528 barrier-related collisions can be expected each year on interstates in the Connecticut data collection area.
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35 and the weak-post three-cable guardrail were studied, as well as the breakaway cable terminal (BCT) , the modified eccentric loader breakaway cable terminal (MELT)
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36 the paperwork. The State Police barracks were used as a secondary means of notification.
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37 a means of managing their roadside hardware inventories and scheduling maintenance work. For example, the Scott county inventory is updated every year and is used as a management tool for identifying installations that need routine maintenance or repair.
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were reported to the police but resulted in little or no damage. The roadside hardware standards used in Iowa are highly standardized and have been stable for many years, so there tends to be a large quantity of one or two types of hardware.
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Maintenance Reports As in Iowa and Connecticut, the NC-DOT attempts to recover the cost of repair from motorists who damage guardrail and other pieces of hardware in collisions. Notification of a crash usually occurs from the investigating police agency and a copy of the crash form is sent to the appropriate DOT maintenance garage.
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Division 7 some interstate barrier repair is being done by a private contractor and the division appears to be pleased with the turnaround time. Durham county currently has a contractor in place, and Wake and Orange counties expect to do the same within a few months.
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Discussion The data collection in North Carolina depended primarily on police notification since most maintenance and repair is contracted out. As a result, the team was able to collect a large number of police-reported collisions but the number of maintenance-only reported collisions was very low.
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