[areafiftyone]

I tend to agree with you. This killer had this all planned. He did his homework before he started. Random shooting so police can't profile him as "serial" and also doing it from far away and from behind so no-one can identify him. The police are not going to catch this person unless he makes a big mistake.

[Diogenesis]

Good point.

Then he would have had a home available
to duck into from one of the 70000 possibilities described by the Table above.

An important alternative to the "close to the highway" hypothesis.