Give Transit the Green Light

A $12.6 billion rapid transit line shouldn't get stuck in traffic

When the $12.6 billion Eglinton Crosstown and $2.5+ billion Finch West LRTs finally open after years of delay, transit riders expect them to be as fast and reliable as possible. 

But waiting at red lights will be built into the Eglinton Crosstown’s schedule, according to the Toronto Star, because the Crosstown will not have active Transit Signal Priority (TSP). The Eglinton Crosstown LRT will operate along the street and need to go through intersections with traffic signals between Kennedy and Laird, with the exception of the Science Centre Station.

TTCriders is calling for new LRTs to have active signal priority. This means when a transit vehicle approaches an intersection, a green light will get extended or a red light will be shortened, so that waiting times at traffic lights are minimized. For example, when active transit signal priority was added to the METRO Green Line in Minneapolis, only 5% of trains stopped at signalized intersections

Take action before April 9, 2025!

Use the form above to send a letter to City Councillors on the Infrastructure and Environment Committee! Ask them to give transit the green light by enabling active transit signal priority. The Committee meets on April 9, 2025 at City Hall to debate the Congestion Management Plan - 2025 Update. You can also sign up to speak at the meeting, by emailing [email protected] to register to speak on item IE20.3. (Email [email protected] for support with your speech).

The report includes an update that Toronto is continuing to expand its signal priority system, with 50 additional intersections set to be upgraded or equipped with TSP by the end of 2025. Currently, 420 signalized intersections in Toronto use TSP, mostly along seven major streetcar routes and four major bus routes. Yet despite the technology being available, transit signal priority is not being used to its fullest potential: a limited form of priority is activated only when vehicles fall behind schedule.  

Why should a few drivers hold up hundreds of transit riders? 

Mayor Olivia Chow has written a letter to the  Infrastructure and Environment Committee, urging enforcement and towing of vehicles that block streetcars. Why should one or two drivers hold up hundreds of transit riders? This same principle should be applied to new LRT projects, by using active transit signal priority.

What are the different kinds of transit signal priority?

Graphics by Nico Zucco.

Full Active TSP (also called unconditional TSP)

  • Full active TSP will typically detect an approaching transit vehicle and modify the traffic signal cycle to allow a green by either extending a concurring green phase or truncating a red phase
  • This does not necessarily mean that vehicles will consistently receive a “green wave” along a line, but that the system will try to minimize time spent waiting at traffic signals 
  • For example, only 5% of trains stopped at signalized intersections when full active TSP was added in Minneapolis.

Limited Active TSP (also called conditional TSP)

  • A transit vehicle may ask for a green light to be extended a certain period of time, only under certain conditions, such as running behind schedule.  
  • Some transit systems use other “conditions” for extending green lights, such as crowding on transit vehicles. 
  • The TTC’s 420 intersections with TSP use “Advanced Transit Signal Priority,” which is a form of limited active TSP that detects vehicles running behind schedule and extends the green phase up to 30 seconds.

Passive TSP

  • Passive TSP does not actively respond to transit vehicles as they approach intersections.
  • Instead, signal phases are predetermined to provide optimal travel time savings to transit vehicles on a line (Source: TSP control at signalized intersections: a comprehensive review, p.2)
  • Passive TSP is not responsive to delays that occur along the line that push trains behind schedule. 

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