![]() I believe there should be a health warning to tables of values such as the above, along the lines of: It is taken from the Austroads design guide (ref.1887), and “shows maximum grades over long lengths of road in various terrain types”. The following table gives one example of suggested values for maximum gradient. Note that it deals with uphill and downhill gradients separately: 857), relates gradient with the performance of vehicles. Of course, subsequent analysis may look at cost/benefit figures, at environmental impact and so on. “General maximum grade: this is the sustained grade at which the truck can maintain a speed corresponding to the design criterion”.įor engineers who are designing a road, the ability of vehicles to travel the road must be a primary input. For example, a definition from an Austroads document on the geometric design for trucks (ref.1887) says: Maximum gradient may be related to the ability of vehicles to maintain a constant speed. ![]() The above definition says what gradient is. What is uphill in one direction of travel is downhill on the other – and of course, how you deal with gradient depends on whether you are travelling uphill or downhill. This definition reminds people that gradient is dependent on direction. In the direction of increasing stake value, upgrades are taken as positive and downgrades as negative.” “The slope of the grade between two adjacent Vertical Points of Intersection (VPI), typically expressed in percentage form as the vertical rise or fall in metres/100 metres. A good definition of gradient is given in (ref. In terms of the vertical alignment of a road, one of the primary design parameters is gradient.
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