London Transit’s realtime.londontransit.ca is the most accurate way to get up-to-date information especially during construction when detours and service changes can occur.
For custom alerts for your route or stop you can sign-up for alerts on Infoweb. Route alerts will inform you by email when there is a detour or service interruption on your route(s). By signing up for stop alerts you are able to set your stop and typical departure time on any given day, you will then receive an email notification approximately 30 minutes before your selected departure time to let you know the upcoming arrival times.
Another option to have quick access to real-time information is to create a shortcut to Infoweb on your phone so checking is quick and easy. Just remember to refresh for the most up-to-date information!