Suspension lights head moving back and forth because wind, wind load of led signal light arm assembly devices. However, many manufacturers prefer light steel support mounted on the road because there are no lights head movement, reducing connection cables of the light head shake, and eliminates the Visual Flash of light head wind caused by the shaking. Lights attached to steel advantage is also that only needs shorter lamp posts, because below the signal head is not suspended in the signal arm. Continuous improvement of aesthetics is one reason use lights attached to steel.
To keep the lamp completely accurate to ensure they will not turn with the wind, these lights the first lamppost arm or base attachment has an advantage over cable attachment.