Hi,
For Chiangmai to Lamphun, Highway11, I am driving there every morning and there is no check point. From Lamphun to Chiangmai, yes there are 2 ... on the Highway 11 only...near Hang Dong fly over.
After Lamphun I cant say (Lamphun/Phrae, etc)
I would say, as I want to move also on a weekend, it would be better to postpone the trip until mid February and see how is the situation, relaxed or more tense. Of course if you can postpone it...
Phil.