A flashing or steady orange hand on traffic signals at intersections means pedestrians must not begin to cross. This flashing hand gives turning vehicles an opportunity to proceed before the light turns red. :)
The radiation fog is formed when the land surface cools after the sunset in the conditions of the clear sky. Thus the cooling ground cools the air above it and as a result of this the conduction causes the air temperature to fall and hence it reaches the dew point and forms a fog.
