<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span class="Apple-style-span" style="color: rgb(128, 0, 128); font-family: Tahoma; font-size: 13px; "> </span></div><div><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div lang="EN-GB" link="blue" vlink="purple" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div class="Section1"><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: Tahoma, sans-serif; color: purple; ">Casing is the border of the road, whereas the fill is the colour in the centre. You’ll see that these are two overlapping lines, with the casing slightly wider than the fill, such that just either edge shows through once the fill is drawn on top.</span></div></div></div></span></blockquote><br></div><div>Thanks. Now I understand. Case had so many translations on leo.org that I thought of something like a tunnel or so. But it is the obvious: a case=box=border.</div><div><br></div><div>Bye</div><div>Ivo</div></body></html>