All Melbourne trams have had transponders which traffic lights can be set to recognise uniquely.
The only reason advantage has not taken of this is lack of willpower by the traffic light authorities.
Regards,
> On 22 Jul 2017, at 16:08, 'Brian'bblunt@... [TramsDownUnder] TramsDownUnder@...> wrote:
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> Could trams be fitted with optical transponder detection systems?
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> In USA, many traffic lights can be manipulated by emergency vehicles using optical detectors at the lights which are activated by an optical transmitter on the vehicles. Using optical system makes them uniquely directional for the direction of the approach.
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> So the rear of each tram could have an an optical transmitter and the front a receiver. That way a tram would not react to a tram approaching on an adjacent track.
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> Brian
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> ----- Original Message -----
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> To:
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> Sent:
> Sat, 22 Jul 2017 15:17:07 +1000
> Subject:
> RE: [TramsDownUnder] Car ahead on the 86 ?
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> I assume that most Melbourne ‘car ahead’ collisions would happen on busy city streets or straight sections such as St Kilda Rd during peak periods when trams follow each other closely and . Do statistics support this opinion ? If so, that is the time for the drivers to be very alert and use technical assistance in safely managing closing speed. A car ahead collision can result in injury to standing passengers as well as costly damage to the trams, and also delays in services.
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> Noel Reed.
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> From:TramsDownUnder@... [mailto:TramsDownUnder@yahoogroups.com]
> Sent: Saturday, 22 July 2017 10:25 AM
> To:TramsDownUnder@...
> Subject: Re: [TramsDownUnder] Car ahead on the 86 ?
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> On Sat, Jul 22, 2017 at 10:14 AM, 'Noel Reed'noelreed10@... [TramsDownUnder] TramsDownUnder@...> wrote:
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> Wouldn’t an anti collision system between trams be an advantage in streets where other options such as permissive signals [as in Wynyard tunnels] or ATP with or without signals cannot be used to space moving trams safely apart.
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> Such a system would have to distinguish between trams on adjacent tracks. On curves, that may be particularly difficult.
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> Hal Cain
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> Virus-free. www.avg.com
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