At 11:12 AM +1100 12-16-03, James Cameron wrote: >The roads are gravel, and require frequent maintenance, so that excludes >inductive loops in the surface. Don't rule this out too quickly. It's the best solution. There is some depth that will be safe from grading. Are you sure you can't pick up a running car at that depth? -- Bryan Mumford Santa Barbara, California http://www.bmumford.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.