{"id":1733,"date":"2024-07-15T15:20:25","date_gmt":"2024-07-15T09:50:25","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=1733"},"modified":"2025-07-16T15:08:14","modified_gmt":"2025-07-16T09:38:14","slug":"geometric-design-of-taxiway","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ce\/railway-engineering\/geometric-design-of-taxiway","title":{"rendered":"Geometric Design of Taxiway"},"content":{"rendered":"<p style=\"text-align: justify;\">Speed of an aircraft on runway is relatively faster than the speed on taxiway. Thus design standards, for a taxiway is not as rigid as they are for runway.<\/p>\n<p style=\"text-align: justify;\">The geometric design standards of taxiway are:<\/p>\n<p style=\"text-align: justify;\"><strong>(i) Length of taxiway:<\/strong> It should be short as it will save fuel consumption. There is no specific recommendation for length.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) Width of taxiway:<\/strong> Width of taxiway is lesser than that of runway because speed at taxiway is lower and aircraft is not airborne. Normally it varies between 7.5 m to 22.5 m.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii) Width of Safety Area: <\/strong>It includes partially paved shoulders on either side plus the area that is graded and drained.<\/p>\n<p style=\"text-align: justify;\"><strong>(iv) Longitudinal Gradient<\/strong><\/p>\n<ul style=\"text-align: justify;\">\n<li>\u00a0Steeper gradient demands greater fuel consumption, so level taxiways are more desirable.<\/li>\n<li>ICAO recommends that maximum longitudinal gradient should be 1.5% for A and B types and 3% for other types of airports.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>(v) Transverse gradient:<\/strong>\u00a0 It is provided for quick drainage. Maximum transverse gradient is taken 1.5% for A, B and C types and 2% for other types of airports.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1734 size-full\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2024\/07\/txiway-cross-section.jpg\" alt=\"Taxiway Cross Section\" width=\"820\" height=\"247\" srcset=\"https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/txiway-cross-section.jpg 820w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/txiway-cross-section-300x90.jpg 300w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/txiway-cross-section-768x231.jpg 768w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>(vi) Rate of change of longitudinal gradient: <\/strong>ICAO recommends that maximum rate of change of slope in longitudinal direction 1% per 30 m length of vertical curve for A, B and C types and 1.2% in 30 m length for D and E types of airports.<\/p>\n<p style=\"text-align: justify;\"><strong>(vii) Sight distance:<\/strong> Since speed on taxiway is slower than runway so smaller sight distance is required comparatively. ICAO recommends that<\/p>\n<p style=\"text-align: justify;\">(a) For A, B, C type of airport, surface of taxiway should be visible from 3 m height for 300 m distance.<\/p>\n<p style=\"text-align: justify;\">(b) For D, E type of airport, surface of taxiway should visible from 2.1 m height for 250 m distance.<\/p>\n<p style=\"text-align: justify;\"><strong>(viii) Turning radius<\/strong><\/p>\n<ul style=\"text-align: justify;\">\n<li>It is provided to change the direction of aircraft path a horizontal curve is required.<\/li>\n<li>The curve is so designed that aircraft can negotiate it without reducing speed significantly.<\/li>\n<li>Circular curve of large radius is preferred.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1735 size-full\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2024\/07\/radius-of-the-curve.jpg\" alt=\"Radius of The Curve\" width=\"583\" height=\"440\" srcset=\"https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/radius-of-the-curve.jpg 583w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/radius-of-the-curve-300x226.jpg 300w\" sizes=\"auto, (max-width: 583px) 100vw, 583px\" \/><\/p>\n<h4 style=\"text-align: justify;\">Note:<\/h4>\n<ul style=\"text-align: justify;\">\n<li>For large subsonic jet R<sub>min<\/sub> = 120 m. (for any value of speed)<\/li>\n<li>For supersonic transport, R<sub>min<\/sub> = 180 m (for any value of speed)<\/li>\n<\/ul>\n<ul style=\"text-align: justify;\">\n<li>According to Horonjeff, the radius of taxiway should be decided such that the distant of the oleo strut of the nearby main gear is not less than 6 m from the pavement edge.<\/li>\n<li>According to Horonjeff, we have<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1736 size-full\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2024\/07\/wheel-tread.jpg\" alt=\"Wheel Tread\" width=\"877\" height=\"246\" srcset=\"https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/wheel-tread.jpg 877w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/wheel-tread-300x84.jpg 300w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2024\/07\/wheel-tread-768x215.jpg 768w\" sizes=\"auto, (max-width: 877px) 100vw, 877px\" \/><\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-danger\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/ce\/railway-engineering\/correction-for-elevation-temperaure-gradient\/\" target=\"_blank\" rel=\"noopener\">&lt;&lt; Previous<\/a> | <a class=\"btn btn-success\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/subjects\/what-is-railway-engineering\/\" target=\"_blank\" rel=\"noopener\"> Next &gt;&gt;<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Speed of an aircraft on runway is relatively faster than the speed on taxiway. Thus design standards, for a taxiway<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[463,2],"tags":[480,481,482,479],"class_list":["post-1733","post","type-post","status-publish","format-standard","hentry","category-railway-engineering","category-ce","tag-length-of-taxiway","tag-longitudinal-gradient-longitudinal-gradient","tag-sight-distance","tag-taxiway"],"_links":{"self":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/1733","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/comments?post=1733"}],"version-history":[{"count":0,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/1733\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/media?parent=1733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/categories?post=1733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/tags?post=1733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}