Some PIR's have a sensitivity adjustment.
Some PIR's come with plastic masks to mask certain areas.
PIR's are far more sensitive to people walking aross the 'beam' than towards it.
A PIR pointing downwards creates a small 'bubble' which is less sensitive and more localised.
Personally, I am not keen on PIR's - they tend to operate frequently when they need not, no matter how hard you try to illiminate false triggering.
All my rear lighting is switched, either inside or out.
I currently have no front lighting at all, although I want to sort this ASAP as winter is HERE. I am still debating the notorious stress of seeing the lights outside ping on due to wind etc.
I have, in the past, fitted lighting on drives connected to the electric gates. This then progressed to simply using IR beams (verys stable to false triggering, PITA to install in terms of running cables).
We have fitted induction loops similar to those used on traffic light priority systems and traffic counters to some sites in the past, more so to trigger the opening of gates and doors for fork trucks and th like, but it does make me wonder weather this would be a good idea for the drive.
Over engineered? Yup. I'm a spark.