I tested 100 times from NW DC in the morning 8:30-10:00. Only 1 to IAD . 99% from METRO to office. Push me faster! I'm late. You get in traffic for $3.75. I'm cheaper then McDonald's cashier? They make $13.5/hr.
I have driven morning rush hour in DC before and there is hardly any IAD trips at that time.
I usually check ETA to IAD via Google maps at rush hour and it's always +45 min.
So if an IAD ping comes through, you should see a "long trip" notification from Uber.
If you don't see that, then don't pick up