What do cones placed on the roadway indicate?

What do cones placed on the roadway indicate?
A)The direction of traffic.
B)They allow crossing the real or imaginary line that joins them, but with caution.
C)They prohibit crossing the real or imaginary line that joins them.Correct
Cones or similar devices prohibit crossing the line, real or imaginary, that joins them.
They are circumstantial signs and prevail over other signs, except for the orders of agents.