For as long as I can remember we've called oleander freeway bushes. They are prominent in the median strip all up and down California's Central Valley. When Bekah moved to Fresno in 1998 I became intimately acquainted with the miles and miles of oleander median. It was comment to drive past oleanders as big as a house, and I'm not exaggerating!
Sometime about 10-12 years ago CalTrans decided they needed to add a center guardrail which meant they buzzed off all of the bushes at ground height. I was just sick!
So this trip, when I saw that some of the large white ones were as tall as semis I felt happy again! All is well in the freeway bush department.