>Thanks Ian, it sounds good. I'll check out the web page at work >tomarrow...the connection there is a whole lot faster. That will actually get you less than you've already got. There's just a precis on the website. The essay is about gravel driveways rather than roads. If it's likely to be of use/interest to you let me know and I'll email it in full. -- -- Ian Evans The World of Old Houses: http://www.oldhouses.com.au Publisher: The Flannel Flower Press Pty Ltd PO Box 591, Mullumbimby, New South Wales, Australia 2482 Phone/fax: +612 6684 7677 Email: [log in to unmask]