Or treated decking. Made plant box's out of them a few time. Would make nice edging, if you use some 2"by" as stakes or even bits of the decking cut sort with a point cut on so its more descreet than the 2"by1".
Aye was thnking the guy that was doing the brake test was in the wrong. Think both partys in the wrong. The bikers shouldn't of been doing that but he shouldn't of charged over the top of them.