Google has started rolling out an update for Maps that displays transit delays. It said the feature is coming to a "few major cities globally" to start, with others, including Canadian cities, to be added soon. It gets its information from your fellow riders and local agencies. It can even display entrances to subway stations and alternate transit routes. Plus, it can show information like if a bridge is too low or if a weather disruption (like a snowstorm) will affect your journey.