Table 1.

Configuration of acoustic warnings.

	4,5 – 3 m	3 – 1,5 m	1,5 – 0 m
[−60°, −30°]	f = 261, l = 50, r = 1, c = right	f = 261, l = 50, r = 2, c = right	f = 261, l = 50, r = 6, c = right
[−30°, 0°]	f = 2,637, l = 50, r = 1, c = right	f = 2,637, l = 50, r = 2, c = both	f = 2,637, l = 50, r = 6, c = both
[0°, 30°]	f = 2,637, l = 50, r = 1, c = left	f = 2,637, l = 50, r = 2, c = both	f = 2,637, l = 50, r = 6, c = both
[30°, 60°]	f = 261, l = 50, r = 1, c = left	f = 261, l = 50, r = 2, c = left	f = 261, l = 50, r = 6, c = left