Highway Maintenance Response Time Standards

DRAFTintegration, configuration management, software upgrades, network support, etc.These activities are often included in ITS operations contracts.Preventive, response and design modification (corrective) maintenance activities arelargely focused on field infrastructure (ITS devices and systems) which includesreplacement of existing systems as they reach their useful physical or technical life.This would also include any consultant effort related to engineering support to assessthe impacts of projects on the existing system or to design planned replacement of thesystem.ITS devices included are 2070 controllers, loop detectors, video image detectors/closedcircuit television (CCTV), ramp meters, variable message signs (VMS), high accuracyradio (HAR), wireline, wireless equipment, computer hardware, and computersoftware/integration. Specific replacement cycles may be found in Table 2. Equipmentfailures should be replaced in accordance with Regional Response Policy.Another consideration for signals and Intelligent Transportation Systems is life cyclereplacement costs. The service life for signals and ITS equipment and systems need tobe considered carefully. These life cycles are likely to be shorter than for otherinfrastructure (i.e. pavements or bridges) due to changes in technology or improvedsoftware/automation systems.16