On December 15, 2016, the 407 ETR proposes to widen the six to eight lanes between Markham Road and York–Durham Line and four to six lanes between York–Durham Line to west of Brock Road. The widening between York–Durham Line and Brock Road began in Spring 2018 and was completed in August 2018 while the widening between Markham Road and York–Durham Line will be done in 2019.[94] A new Whites Road interchange (currently Sideline 26) will also be built.

On December 15, 2016, the 407 ETR proposes to widen the six to eight lanes between Markham Road and York–Durham Line and four to six lanes between York–Durham Line to west of Brock Road. The widening between York–Durham Line and Brock Road began in Spring 2018 and was completed in August 2018 while the widening between Markham Road and York–Durham Line will be done in 2019.[94] A new Whites Road interchange (currently Sideline 26) will also be built.

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