Accurate, Easy to Read
I live on the Metro, so I use this all the time. Its intuitive, simple, and accurate. I especially like the overlay of the Metro on the Google map, and the ability to quickly find the nearest Metro. The time of the next train is accurate to within 20 seconds; its synched to the times you see on the Metro display boards. Time to travel to a distant Metro would be a great additional feature.
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Next Metro DC