The United Kingdom has been doing this for years and it works. A gate (or some variation thereof) is triggered by a transponder on the bus. The bus goes through; automobiles cannot follow as the gate immediately descends.
<CAMBRIDGE, UK, a bus approaches the Bus Gate; photo – Keith Jones>
<PRESCOTT, UK – you can’t beat one of these – photo Allistar Macdonald>
<CP24 PHOTO ABOVE – this is a car being pulled out of the tunnel>
<Toronto Star PHOTO – these $61,000 gates were recently installed and should do the trick.>
Over the last four years there’ve been 26 incidents of cars entering the Queen’s Quay streetcar tunnel, causing delays to service and an expensive rescue. The TTC has installed yellow bollards and painted the tracks red – to no avail. But, to defend the driver, especially at night it can be quite confusing down there.