Sharraxaadda

The traffic light at 116th Ave SE and Kent-Kangley Rd is too short going west and turning left onto 116th. My mother lives just past 132nd so I am headed back to Des Moines about 2-3 times a week. The turn lane has 2 lanes but only lets 2 or 3 cars through at a time. It is very frustrating to sit through 2 lights minimum every time. And if there is a big truck it always has to run the light. Could it be changed a little to let more cars through?
This is also happening on 116th heading East in the turn lane!