Sharraxaadda

Traffic backs up heading west bound on Mount Vernon (all the way to Mount Vernon Way) because the traffic signal at Mt. Vernon and Dunwoody Village Pkwy always gives the green arrow regardless if anyone is in left hand turn lane. Also, light seems to change too quickly when someone at light on Dunwoody Village Pkwy heading south attempting to turn west on Mt. Vernon. Needs some adjustments....please help!!!