[serf]

> It can determine traffic direction; which is a leap beyond current technology i.e. a break beam, which cannot.

all it would take is two or more beams and some pretty simple code, am I missing something?

[escobar]

Nope, not missing anything. There are 2 beams (IR) per one of their "sensors", and it's assumed they're determining direction by noting which beam fires first vs second.