The middle of a group of three proximate SPB bridges spans the
quietest of the roads.
In past decades high, feathery cirrus clouds were less common during
summer months. The amount of cirrus has increased with the number of
jet flights. While airplanes were grounded for a few days post 9-11,
the quantity of cirrus diminished, and US temperatures temporarily
fell back to near their pre-global-warming levels.
Per the NASA study linked below, "This result shows the increased
cirrus coverage, attributable to air traffic, could account for nearly
all of the warming observed over the United States for nearly 20 years
starting in 1975..."
NASA links warming to jet flights