The head of Metrolinx says the next big transit projects in the GTA will be a relief line in downtown Toronto and an extension of the Yonge subway line north to Richmond Hill.

These projects are part of the provincial transportation agency’s The Big Move plan, which outlines a common vision for transportation in the Greater Toronto and Hamilton Area over the next 25 years.

“We already have over $16 billion invested in projects from The Big Move that are now in progress, but we need to keep moving forward and that’s why I’m pleased to unveil the next wave of projects,” CEO and president Bruce McCuaig said in a release Thursday.

Other projects include light rail transit (LRT) in Mississauga, Brampton and Hamilton, and bus rapid transit (BRT) in Durham, Toronto, Peel and Halton. The next wave also includes investment in the GO Transit rail network, including line extensions, more two-way, all-day service, and electrification of both GO lines and the Union Pearson Express (formerly called the Air Rail Link), the agency said.

“With our plan in place, it’s now time for the big conversation about the best ways to pay for this $34 billion investment,” McCuaig said.

Last month, the TTC endorsed a staff report, which recommended a $3.2-billion rapid transit line between downtown and the city’s east end to reduce overcrowding on the subway. It also voted to make the so-called downtown relief line a priority over extending the Yonge subway line north to Richmond Hill.

More than $16 billion from all three levels of government were allocated to The Big Move’s first wave of projects, and those now under construction include the Eglinton-Scarborough Crosstown LRT, the Toronto-York Spadina subway extension, the Mississauga BRT, the Union Pearson Express and new dedicated bus lanes in York Region.