Gate represents information about a particular exit or entrance.
on the road graph with coordinates
to enter/exit this gate, value in range 0, 1. Warning: currently this field contains 1.0 for all gates, would be improved in the future.
distance to the gate in meters:
if represents entrance outside the object - positive
if represents entrance inside the object - negative
if represents exit outside the object - zero
if represents exit inside the object - positive