David
One of my friends has a long driveway and has a sensor that detects when a vehicle enters the driveway which sends a signal inside the house. That way you know someone is coming and can take appropriate action.

Peter
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Peter Kaufman
NRA Life
GOA
SAF
RKCC CM-023
RKS #5642
SHAG # 005
Ironwood Nut
Life is too short to have ugly knives