It's always been difficult for southbound traffic on Maple to turn left onto Michigan Ave, since they have to wait for the northbound Old Creek traffic to clear. With the additional traffic rerouted onto Henry St now, the line of traffic coming up to US-12 from Old Creek is solid, and the waiting traffic at Maple wanting to turn left onto US-12 can only increment 1-2 vehicles at a time.
A good idea would be to sync the traffic light at Old Creek & Henry with the northbound light from Old Creek. The northbound traffic at Old Creek could be green while the southbound light at Maple and US-12 would be red. When the northbound light off Old Creek turned red, THEN the light for the southbound Maple traffic would turn green and southbound Maple traffic could clear easier and create less of a traffic jam.