All regulations disturb the randomness of the vessel traffic stream. In the present paper the effect of the following regulations on the vessel traffic stream has been analysed: the order to maintain minimum distance between successive vessels, speed limit, overtaking ban, passing ban. These regulations disturb the Poissonian nature of the stream of reports. Using the method of random variables convolution the density function of probability was determined of the disturbed vessels' stream of reporting for particular factors controlling traffic on the fairway.
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