However turning off ITS equipment is essential in order to accurately assess

However turning off its equipment is essential in

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traveler information through ITS. However, turning off ITS equipment is essential in order to accurately assess ITS benefits. Without an appropriate control situation (i.e., without ITS performance) the relative improvement (or worsening) due to ITS deployment cannot be accurately estimated. Thus, state agencies are encouraged to consider not using ITS for a few days during the work zone to provide sufficient control data for evaluating ITS effectiveness.
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6 Table 2. Data Needs for the Five Performance Measures Benefit-Cost Analysis Even though benefit-cost methodology has been implemented in other transportation areas, the application to work zone ITS involves additional considerations such as the need to include technology cost factors and the computation of dynamic road user costs. Cost Calculations The total cost of the deployed ITS system includes the cost of equipment, the cost of operation, and the cost of set up. The total cost is represented as Diversion rate Monitoring Traffic sensors Gather volume counts at alternative route entrances, and mainline ITS to communicate with drivers Pre-trip info: website, news releases, or radio In-route info: DMS, Portable DMS, or HAR Management: ITS system, ITS software, and/or Control center Messages could include ‘Use alternative route,’ ‘Delay ahead,’ ‘Work zone ahead,’ and ‘Travel time’ Delay time Monitoring Traffic sensors Gather travel times or speeds along corridor ITS to communicate with drivers Pre-trip info: website, news releases, or radio In-route info: DMS, Portable DMS, or HAR Management: ITS system, ITS software, and/or Control center Messages could include ‘Delay ahead,’ ‘Work zone ahead,’ and ‘Travel time’ Queue Lengths Monitoring Traffic sensors, Queue trailers Gather queue length or speeds along corridor ITS to communicate with drivers In-route info: DMS, Portable DMS, or HAR Management: ITS system, ITS software, and/or Control center Usually queue lengths are not reported with other pre-trip info. Messages could include ‘Slowed traffic ahead,’ ‘Reduced speeds ahead,’ ‘Crash ahead,’ and ‘Delay ahead Crash Frequency Monitoring Crash reports Gather crashes occurring along corridor ITS to communicate with drivers Pre-trip info: website, news releases, or radio In-route info: DMS, Portable DMS, or HAR Management: ITS system, ITS software, and/or Control center Only communications directly related to safety are expected to affect crash rates. Messages could include ‘Crash ahead,’ ‘Reduced speeds ahead,’ and ‘Crash rate statistics’ Speed-based measures Monitoring Traffic sensors Gather speeds along corridor ITS to communicate with drivers Pre-trip info: website, news releases, or radio In-route info: DMS, Portable DMS, or HAR Management: ITS system, ITS software, and/or Control center Messages could include ‘Reduced speeds ahead,’ ‘Crash ahead,’ ‘Work zone ahead,’ ‘Travel time,’ and ‘Delay ahead’
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7 where, permanent ITS equipment cost per single work zone application duration + costs of any temporary ITS equipment deployed for the application
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