Comment by slowhand09

I think of this as I drive 30ish miles each way to work. 5 miles of surface roads, 19 miles of interstate (2 lanes each way), and 6 miles of surface (2 lanes each way). One cause for increased construction is the need for more capacity. My frequent lament is poor driving habits. We have regular instances of sub-optimal speeds in both lanes. A 65 mph limit and vehicles driving 55mph in both lanes, frequently with 1/4 of open lane ahead. Vehicles behind begin to crowd and we experience the slinky effect. After 3 years we add another lane. And the cycle continues. Driver education used to emphasize keeping right except to pass. I think this isn't taught anymore.