So after going through several versions before finding a look that works, I've completed my INAT (
http://www.inat.fr/about/maps/) version of the GTHA. There's a specific set of rules that INAT maps follow, including all lines must be either 0º 45º or 90º, the map must be square, a standardized method of displaying transfers and different line types.
With that said, here's what I've come up with:
(
https://dl.dropboxusercontent.com/u/43869799/INAT GTA v4.jpg)
Because the GTHA is such an east-west region, fitting it onto a square map was challenging. I had to bend both Durham and Halton regions to show as being vertical instead of horizontal. I also tried to maximize the number of routes that were running either diagonal or N-S (on paper), because based on INAT standards labels need to be horizontal (no angles). This makes putting labels on a horizontal line very difficult.
Another thing from a transit perspective is the E## routes that use a DRL tunnel under King/Wellington. The branches run to the inner 905 centres, maximizing the "relief" part of the DRL.
If you have any questions about any other aspect of the map, just ask, haha.