These photos are from a few weeks ago after a light snow. Winter's a good time to see all the dirt and oil left by cars and trucks passing by. This looks like a lot of oil, but it spreads out so thin that looks can be deceiving--a good thing because this will be swept eventually into the storm drain and into Carnegie Lake, via Harry's Brook.
The sequence of oil droplets headed around the corner to the left. Snow makes visible the dark patina left by car tires, brake linings and drops of oil, all of which come under the heading of nonpoint pollution.
One other benefit of hybrid cars is that their brake pads last much longer, since much of the braking power comes from sending energy back into the battery from the wheels. All of which is to say they contribute less to the nonpoint pollution accumulating on the pavement.
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