Congestion tolling saves motorists an enormous amount of time that would otherwise be spent stuck in traffic, thereby reducing stress, saving fuel, and making trip times much more predictable.

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Users have complained loudly about dropped calls in particular, a result of the network stress brought on by iPhone users' heavy data traffic.

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Some stress-reactive people time their commutes to avoid traffic, set time limits on stressful meetings or schedule onerous tasks at times when they aren't tired or hungry, says Ms. Martin, founder of WorkLifeNation.com, a website on managing stress.

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Elena Piskunova likes to sing melancholic Russian folk songs in traffic jams - she claims it's the best way to relax muscles and relieve stress.

BBC: What Muscovites get up to in traffic jams

Along the way, I texted friends, received a reminder about an upcoming ski trip and the need to refuel my car soon, considered an ad for a BBQ joint, got a notification about a traffic accident ahead and a recommendation on the speediest route around it, took stock of my stress level, and picked the closest and cheapest parking spot.

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