Google Now does precisely this, alerting you when traffic situations have changed and you need to leave earlier than expected. When it works, it's pretty cool; when it doesn't, it's quite annoying. A friend was surprised a few years back when his phone told him to leave now-ish, for his flight in 3 hours, because things were getting hairy en route...
Apple Maps, meanwhile, has smarted up enough to figure out that my 10am appointment "Whatever" is highly likely to take place at my office, and plots a course there automatically...but is dumb enough to do so even when it is 10pm the night before. Smartstupids, they are.
edit for the OP: Waze does (did? I gave up on them when they started showing me ads instead of directions) a good job of summarizing traffic along your expected route, showing a long linear view of the route along the bottom with traffic and events (police, accidents, etc.) along the way.
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Date: 2017-07-19 02:48 am (UTC)Apple Maps, meanwhile, has smarted up enough to figure out that my 10am appointment "Whatever" is highly likely to take place at my office, and plots a course there automatically...but is dumb enough to do so even when it is 10pm the night before. Smartstupids, they are.
edit for the OP: Waze does (did? I gave up on them when they started showing me ads instead of directions) a good job of summarizing traffic along your expected route, showing a long linear view of the route along the bottom with traffic and events (police, accidents, etc.) along the way.