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Yonge North subway extension:
Surveying, lane closures, starting December 19



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Two transit agencies and two municipalities are starting the preliminary planning, design and engineering phase of a project to extend the Yonge branch of the TTC’s Line 1 Yonge - University subway into York Region.

Yonge subway extension map.jpgMetrolinx, the TTC, the City of Toronto and the Region of York are planning to extend the line 7.4 kilometres (4.6 miles) through the Thornhill area of Markham and Vaughan to Richmond Hill. The four partners expect this phase of the project to continue for about a year.


Crews are getting ready to start field investigations along the corridor during the next several months.

From 7 p.m. Wednesday, December 19 until 5 a.m. Thursday, December 20 and continuing overnight nightly, crews start overnight geophysical testing and surveying activities on Yonge Street between Steeles Avenue and Langstaff Road. They’ll use a pick-up truck and a 90-metre- (295-foot-) long geophone streamer to collect and record geophysical data on Yonge.

They start working just north of Steeles and continue northward toward Langstaff. As they progress, temporary work zones block the northbound centre lanes. Crews take readings every 100 metres (398 feet). Each reading requires the crews to block traffic lanes for about 15 minutes. This activity will not restrict access to businesses and properties near the work zones.

According to the Region of York, “this work is typical for subway planning and may include some construction-related noise from equipment.”

“Paid-duty” York Regional Police officers will be on-site to help guide traffic.

geophysical.jpgYork Region Transit passengers aboard buses along these routes can expect delays:

  • Viva blue;
  • Viva pink;
  • 2 Milliken;
  • 3 Thornhill;
  • 5 Clark;
  • 77 / 77A Highway 7;
  • 98/99 Yonge late-night; and
  • 99 Yonge.

Geophysical testing and surveying for the future Yonge subway extension — and the resulting YRT delays — continue until 5 a.m. December 22.