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Managing Traffic Incidents - University of Queensland

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(Continued from page 29)<br />

Each toll gantry has a roadside computer to<br />

store data and to transmit data to the central<br />

computers at the City link Control Room. Each<br />

subsystem is dedicated to serving a zone <strong>of</strong> the<br />

highway: the vehicle enters the classification<br />

zone prior to the changing zone. Finally, if the<br />

vehicle rear license plate is to be recorded<br />

(optional) the image is captured in the enforcement<br />

zone. These zones overlap and their relative<br />

sizes and positions is known collectively as<br />

the system 'geometry' as shown in the figure<br />

above.<br />

The combination <strong>of</strong> proven system geometry,<br />

backed up by extensive field trials and simulation<br />

demonstrated that a single gantry design<br />

was possible for reliable e-TAG device and<br />

CityLink Pass operation. Meeting the charging<br />

and enforcement accuracy requirements in a<br />

pleasing gantry design was possible while ensuring<br />

accurate charging and enforcement for<br />

vehicles driving at twice the speed limit without<br />

compromising security. The same Tolling Point<br />

geometry is applicable to areas prone to congestion<br />

and interurban highways subject to frequent<br />

high speed traffic and a combination <strong>of</strong><br />

commuters, commercial vehicles and visitors -<br />

a mix typically found in interurban corridors.<br />

The complete City Link concession area is<br />

served by nine Tolling Points, each comprising<br />

a CEN standards-compliant DSRC system,<br />

stereoscopic Vehicle Detection and Classification,<br />

an array <strong>of</strong> Vehicle Recognition cameras<br />

and associated low impact lighting.<br />

Every vehicle using the highway has either to<br />

apply for an e-TAG device or use the innovative<br />

CityLink Pass system that matches a vehicle's<br />

license plate with a prepaid CityLink Pass<br />

list. The two methods work together and provide<br />

commuters and casual users alike with the<br />

possibility to pay tolls at mainline speeds.<br />

Purchase or Payment<br />

Customer service<br />

The CityLink Pass system serves infrequent<br />

users and also serves those motorists who wish<br />

to try the City Link before applying for an e-<br />

TAG device. CityLink Pass allows unlimited<br />

travel on the City Link on any nominated day<br />

and can be purchased in advance with a credit<br />

card by phone or by midday <strong>of</strong> the day following<br />

travel. CityLink Pass effectively makes the<br />

City Link available to both commuters and visitors.<br />

Embracing all Users - a Tag or a Daypass?<br />

One <strong>of</strong> the major challenges <strong>of</strong> a fully electronic<br />

toll system is to ensure that the system is<br />

also convenient for all users, whether or not<br />

they have an e-TAG device. So the concept <strong>of</strong><br />

CityLink Pass was born. Drivers merely have to<br />

call the CityLink Pass <strong>of</strong>fice before they travel,<br />

or visit a customer centre, or use one <strong>of</strong> many<br />

Touch kiosks located at Shell service station<br />

outlets across the state, and by giving their<br />

credit card number and license plate details,<br />

they can register to use the highway for an<br />

unlimited number <strong>of</strong> times during any 24 hour<br />

period they choose.<br />

CityLink Passes proved to be very popular<br />

with infrequent users and daily sales have been<br />

over 5,000. When a CityLink Pass registered<br />

vehicle travels past the Tolling Point an image<br />

<strong>of</strong> the license plate is captured by digital cameras<br />

mounted on each gantry and the decoded<br />

numbers compared with the CityLink Pass List.<br />

If there is a match the user is allowed to pass.<br />

The same camera system is also used for enforcement.<br />

Vehicles without a valid e-TAG account<br />

and not on the CityLink Pass list are recorded<br />

by means <strong>of</strong> the digital image taken by<br />

the roadside cameras. This image is confirmed<br />

by the Link Operator and a check is made to<br />

ensure that the vehicle is not linked to an ac-<br />

Accounts can be topped up on line<br />

CityLink Customer Centres<br />

Shell Touch Outlets<br />

an electronic self-contained vending unit, which in addition<br />

to selling other products and services, sells CityLink<br />

Passes and accepts Account Top Ups for Standard<br />

Accounts<br />

Australia Post Offices<br />

Automated telephone service 13 26 29<br />

Mail<br />

using a credit card<br />

CityLink Passes; e-TAGs and top up account<br />

electronic Touch Machines have been installed in 120<br />

Shell Touch Outlets across Melbourne and Victoria - they<br />

dispense all types <strong>of</strong> CityLink Passes and allow customers<br />

to top up their CityLink Accounts. The machines accept<br />

debit cards (EFTPOS) as well as all credit cards<br />

sell CityLink Passes; e-TAGs and can top up accounts<br />

CityLink Passes; e-TAGs and find out account balance or<br />

top up account<br />

Can open a CityLink Account by mail, print out Application<br />

form from web site<br />

30 DECEMBER 2001

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