http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Objective assessment of road defects? en Tue, 19 May 2026 03:27:35 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=15656#post-202538 Thu, 22 Oct 2015 20:48:13 +0000 Tulyar 202538@http://citycyclingedinburgh.info/bbpress/ <p>Mainly from a discussion on the tram track and the transverse profiles filled with ridges and slots.</p> <p>Here's a way to take a profile of a defect in the road surface, with a profile comb.</p> <p>Here's a profile comb </p> <p><a href="http://www.screwfix.com/p/forge-steel-profile-gauge-10/7233c" rel="nofollow">http://www.screwfix.com/p/forge-steel-profile-gauge-10/7233c</a></p> <p>Put the comb down on the profile and push down the elements so that the lower ends take the shape of the rail-road profile.</p> <p>Take a sheet of card and place it against the comb so that with a pencil or pen you can trace the transferred profile from the upper ends on to a flat surface for measuring up later.</p> <p>You can also get a more subjective assessment using a straightedge (joiner's folding ruler)</p> <p><a href="https://www.flickr.com/photos/h52/21748824728/in/dateposted-public" rel="nofollow">https://www.flickr.com/photos/h52/21748824728/in/dateposted-public</a></p> <p>Using coins of the realm you can measure the gaps - a £2 coin - 2.5mm - 3mm = limit for height of manhole frames &amp; other ironwork above new road surface. Tactile tramlines = 5mm = 2 coins </p>