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There is no limit. However, where the system is designed to activate the railroad crossing is determined by design engineers and within the limits of the regulations covering this. In the US, an active railroad crossing (gates and/or crossing lights, and rarely, just a bell) is required to be activated 20 seconds prior to the train's arrival. Crossing gates are required to be horizontal prior to the trains arrival as well. In addition, very wide crossings may require "clearance time" before the train arrives, and trains that have full closure (often being "four quad crossings") may require additional time as well. If the grade crossing is interfaced with highway traffic signals, even more time is needed.
After all the time needed is added, which can range from slightly over 20 seconds to as much as 2 minutes for when the train needs to begin the process, the highest train speed is then determined. The distance this must begin is simply the speed of the train multipled by the time required.
A 10mph train and 25 seconds activation = 10mph converted to feet per second, which is 15, times 25 = 375 feet.
A 110 mph train (the fastest in the US) and 1 minute activation = 161x60 = 9,660 feet.
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