Beware of costs, utility, reliability, and maintenance issues in deploying a statewide transportation network monitoring system.
Statewide systems implementation experience from iFlorida Model Deployment
The main objective of iFlorida statewide operations was to establish statewide traffic management by deploying new traffic monitoring devices and consolidating those devices with existing sources of statewide traffic data, then disseminating this data to the public as traveler information and to decision makers in need of statewide traffic information-primarily those involved in hurricane evacuation decision making. A key component of the statewide operations monitoring was the deployment and maintenance of a statewide traffic monitoring system.
- Beware that travel costs can make the costs of maintaining a statewide traffic monitoring system high. Twenty-five traffic monitoring stations, including radar for traffic detection and video, were deployed at existing microwave communication towers. These stations used available bandwidth in the microwave network to transmit these data back to the District 5 Regional Traffic Management Center (D5 RTMC). One challenge faced by designers of the Statewide Monitoring System was related to the maintenance of field devices distributed across the state-some of the stations were located more than 400 miles from the FDOT D5 offices in Deland, Florida. The cost of traveling to each site from Orlando made maintenance visits expensive. FDOT took this into consideration in the system design, deploying network-addressable Uninterruptible Power Supply (UPS) at each station so that equipment could be rebooted remotely. It was hoped that being able to reboot equipment remotely would reduce the need for expensive onsite maintenance.
- Work cooperatively with the potential users to ensure that the statewide monitoring system satisfies users' data needs. After the statewide traffic monitoring system was deployed, the system did not develop a regular set of users. FDOT had anticipated that the data from this system would be useful for traveler information and to support hurricane evacuation decision making. RTMC operators found that the stations were too widely spaced to consistently provide statewide traveler information. While the SEOC was very interested in using video from the Statewide Monitoring System during hurricane evacuations, SEOC's actual use of the video was irregular, only occurring during hurricane evacuations. The combination of high maintenance costs and no regular users meant that FDOT D5 placed a lower priority on maintaining this field equipment than the equipment that was less costly to maintain and used more frequently. The result was low availability of the Statewide Monitoring System, as reflected in FDOT's maintenance logs. The average length of time a device was inoperable was almost 50 days, much longer than for devices FDOT D5 maintained within its district.
- Identify and rectify equipment maintenance problems to make the system reliable to users. FDOT believed that one cause of maintenance problems was the power supplies, noting that the power transformer was deployed in the equipment room and a 25 V line made a long run to the field equipment. FDOT also noted that the software it used to interface with the Statewide Monitoring System field equipment caused some of the problems it observed. At times, FDOT personnel could view video if they accessed the video controller directly, but could not view the video through the software the agency used to manage the video at the RMTC.
- Involve all DOT districts in the design of a statewide monitoring system to make it easier to distribute maintenance responsibility for the monitoting stations across the districts. FDOT D5 also anticipated that the districts in which the Statewide Monitoring System equipment was located would take over responsibility for maintaining the equipment (each district was already responsible for maintaining the microwave tower equipment in its boundary). This did not occur during the iFlorida operational period. This may have been caused, in part, by the fact that the other FDOT districts were not involved in the design of the Statewide Monitoring System. FDOT D5 received push-back from some districts when deploying the Statewide Monitoring System equipment because the districts had not been given the opportunity to verify that the new equipment was compatible with existing equipment. Initially, monitoring equipment was under warranty for maintenance performed by the vendor, which was contracted to deploy the equipment. In August 2007, FDOT D5 took over maintenance responsibility for the Statewide Monitoring System. At that time, FDOT D5 requested that the other FDOT districts take over maintenance of the equipment in their district. Districts that had an active ITS program were willing to take over this responsibility. Some districts had little or no ITS equipment deployed and no staff or maintenance contracts for maintaining ITS equipment. These districts were not interested in maintaining this equipment.
Author: Robert Haas (SAC); Mark Carter (SAIC); Eric Perry (SAIC); Jeff Trombly (SAIC); Elisabeth Bedsole (SAIC): Rich Margiotta (Cambridge Systematics)
Published By: United States Department of Transportation Federal Highway Administration 1200 New Jersey Avenue, SE Washington, DC 20590
Source Date: 01/30/2009
EDL Number: 14480URL: http://ntl.bts.gov/lib/31000/31000/31051/14480.htm
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CCTV, closed circuit television cameras, road monitoring, sensors, vehicle detector, traffic detection, traffic monitoring, congestion monitoring