My company helped build the antennas for Streetline's sensor packages. All the electronics, batteries, and antenna gets potted up in epoxy and is every bit as durable as any other raised pavement marker. Of course, that makes it every bit as vulnerable to snowplows, unless they are recessed into the pavement. You can beat them up if you've a mind to, but rubber tires are not a significant threat, no matter how much weight is on top of the tires.

I realized there was a problem when my solar beach house got flooded. -Apollo