Though this is called Second Season, its sort of the 5th season (including the movie, ovas, etc before).
In this season they are back to the format they started with - a slice of life of people in the traffic department with some romance thrown in. And this is the season that I liked the best so far.
Story structure is similar to the 1st ova, so nothing new to say, but they have polished and edited out a lot of the rough edges, so its nicer to watch.
And if you liked the 1st ova, then you should definitely see it.