I have had the same experience with my motion sensor picking up unwanted street traffic. So I used a temporary cardboard mount that held the motion sensor at a 45° forward tilt from vertical.
This configuration reduced the forward range enough to not sense the street traffic while maintaining substantial side sensing.
I liked the way it worked and decided to make a permanent 45° mount. I thought about bending some 1.25" aluminum strip for the mount but maybe the metal could interfer with sensor transmission. So I went with plastic. I went to Tap Plastic and had them cut some 1-1/4" strips of 1/8"
PVC. See pictures.
Victor Maletic
P.S. Those with 3D printers could easily print one.
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