Three routes extend into the Cities of Mississauga, Vaughan, and Toronto, with the first corridor having started service in fall 2010.

[1] Unlike other, similar, services and partly due to Brampton's diagonal geographic position relative to Toronto than other suburbs such as Mississauga or Vaughan, many Züm corridors will overlap significantly with other agencies' services, requiring more complex, co-operative planning between neighbouring cities.

Buses usually operate in mixed traffic, although Route 501 Queen uses the Highway 7 Rapidway, a busway built for York Region Transit's (YRT) similar Viva network, while travelling through most of Vaughan, and stops at all stations along YRT's Viva Orange route.

This was particularly convenient during a labour dispute involving some contractors operating YRT resulting in the temporary suspension of Viva Orange.

In preparation for the launch of Route 501 (Queen Street), Brampton Transit re-built its Bramalea City Centre Terminal, relocating it from its previous location beside Clark Boulevard, on the south side of the shopping centre, to the northeast corner, nearer to Queen Street.