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Intelligent Transportation Systems - City of Oakland

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events, or during unforeseen incidents, or along evacuation routes during siren<br />

emergencies.<br />

TBS Recommendations - Based on the stakeholder input, TBS could be an effective<br />

traffic control device around the Coliseum area, along detour routes during major<br />

incidents or along predetermined evacuation routes during emergencies. During<br />

incidents on the freeway, TBS could be used to guide motorists along a detour route and<br />

direct them back to the freeway downstream <strong>of</strong> the incident. TBS could be implemented<br />

as a low cost alternative to DMS or could be used in conjunction with DMS.<br />

4.2.5 Highway Advisory Radio<br />

HAR systems are usually located at roadside stations and communicate locally relevant<br />

traveler information to all vehicles in the vicinity <strong>of</strong> the station. They are commonly<br />

"broadcast only" (infrastructure to vehicle) systems using the conventional AM broadcast<br />

band radio in the vehicle; however, FM broadcasts are becoming more prevalent. HAR<br />

can provide travelers with information regarding construction activities, special events,<br />

road closures or hazards, inclement weather, traffic congestion, incidents, alternate<br />

route guidance, and traveler information concerning local attractions. The transmission<br />

range <strong>of</strong> traditional HAR systems is limited to a few kilometers.<br />

The Federal Communications Commission (FCC), initially authorized traveler information<br />

stations (TIS) which include HAR, for use in the United States in 1977. These systems<br />

also are used by airports, train and bus stations, national, state and regional parks,<br />

counties and local municipalities, sports arenas, convention centers, and other<br />

entertainment venues, for disseminating traveler information. HAR uses AM or FM radio<br />

frequency spectrum. Until approximately two years ago, the AM broadcast band<br />

encompassed 530 kHz to 1610 kHz. Many automobile AM radios operate only within this<br />

range. Manufacturers are now modifying their equipment and most radio models sold in<br />

the last two years tune from 510 to 1710 kHz which are the new limits <strong>of</strong> the AM<br />

broadcast band since an FCC ruling in April 1992. All 1993 and later new vehicle radios<br />

will tune from 510 to 1710 kHz.<br />

HAR Recommendations - HAR has already been implemented on 1700 AM by the<br />

<strong>Oakland</strong> International Airport to provide parking information and information on<br />

construction conditions. The Port <strong>of</strong> <strong>Oakland</strong> has indicated that it would not be feasible<br />

to share this HAR station for other traffic information purposes. HAR has also been<br />

implemented for Coliseum events on 1530 AM to help guide motorists into and out <strong>of</strong> the<br />

Coliseum area at the beginning and end <strong>of</strong> special events. It is not recommended that<br />

the <strong>City</strong> <strong>of</strong> <strong>Oakland</strong> to implement any more HAR stations at this time.<br />

4.2.6 Parking Guidance <strong>Systems</strong> (PGS)<br />

Results <strong>of</strong> the <strong>City</strong> workshop identified the need for a PGS for the <strong>Oakland</strong> International<br />

Airport and possibly the downtown Convention Center parking garage. The Airport has<br />

a main garage near the Airport Terminals and a large remote lot that are ideal<br />

candidates for PGS.<br />

PGS have been used in Europe and Asia for nearly fifteen years but are relatively new to<br />

the United States but they are gaining in popularity. In fact, the <strong>City</strong> <strong>of</strong> San Jose has<br />

<strong>City</strong> <strong>of</strong> <strong>Oakland</strong> ITS Strategic Plan<br />

42 September, 2003

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