The idea as great, but it doesn’t work as you’d expect it to. First of all, it’s not uncommon to have a driver accept your ride, but stay for a long time just standing still, or even worse, just drive in the opposite direction you are. Also, it usually takes a long time for one to pick you up. So you should request your trip 30-20 minutes before you are ready to go.
That being said, I have had some good rides, with little to no time waiting for the driver, and getting to my destination in a much faster and more comfortable way than buses. These just were more a exception than a rule.
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