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The taximeter is programmed with what’s called
“critical speed”. This critical speed is the point in which the taximeter begins
to calculate “wait time” into the total fare rather than distance. When
the vehicle reaches speeds above critical speed, the meter stops calculating
“wait time” and calculates the fare based on distance. The taximeter will never
calculate both “wait time” and "distance" simultaneously.
With this in mind, It is normal behavior for the
meter to increase (increment) the fare amount when the taxicab is stopped or is
traveling at a low rate of speed. When the meter is calculating distance,
the meter amount will increase .65 cents every 1/4 of a mile. When the
meter is calculating wait time, the meter amount will increase .65 cents every
78 seconds. These calculations, though not simultaneous, are prorated.
So if you're stopped in the taxicab and you see the meter amount increase, this
is normal.
With all this is mind, it's almost impossible to calculate "wait time" while in
route or before a trip is actually taken. The only calculatable "wait time" is
if a passenger requests a layover or a "stop and wait" from the driver.
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