I am to have such a demand:
1, have 2 road a, b, the average daily traffic situation is very similar, but a elastic as b (b holiday yoy increase amplitude);
2, b annual data is complete, a loss of 20%,
Want to fill the lack of a road traffic: b is fitted curve of the road, and then using regression algorithm to fill a missing value,

What is thinking? Or the idea has a problem, I have a better solution?
Thank you very much! High marks for