Category Archives: comparative geometrics

More notes on road design standards (1)

Many countries publish “standards“, notes, advice and requirements related to the geometric design of roads. But as I have argued before (see for example here) there are too many of these standards. What makes life more difficult for engineers is … Continue reading

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Notes on “design speed”

Speed – and in particular design speed – is a key parameter in determining values for a number of highway geometric features in highway design. Examples include horizontal radius and stopping sight distance. There also seems to be a  relationship between … Continue reading

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NMT in developed countries

Following on from the last post I came across a document by Piet Rietvald of the Netherlands which was published in 2001. The document is called “Biking and Walking: The Position of Non-Motorised Transport Modes in Transport Systems” (ref. 2254). … Continue reading

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NMT in developing and developed countries

There is a page on the Internet (here) which lists different modes of transport, grouped under the headings of: Intermediate Means of Transport (IMT) Non-Motorised Transport Modes (NMT) The two lists partly contain the same modes, so they could be … Continue reading

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Non-Motorised Transport – “bring back the old”

Photo: Dr. Placide Badji A lot of the discussion about road transport concentrates on the problems of road space for cars and trucks. It is probably fair to say that- even in developing countries – transport plans firstly look to … Continue reading

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Road gradient – (1) definition and vehicle performance

Definition of gradient In terms of the vertical alignment of a road, one of the primary design parameters is gradient. A good definition of gradient is given in (ref. 148), which says:

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Simplification of standards (4) primary and local documents

In 2011 Los Angeles County, USA published the “Model streets design manual” (ref. 2206). The document is worth reading in itself. But in terms of the simplification of its standards the website (here) gives an interesting explanation of its purpose:

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Argentina – mountain roads course

Argentina’s University of San Juan has a special School of Engineering of Mountain Roads (Escuela de Ingeniería de Caminos de Montaña, EICAM). Applications for the School’s doctorate in mountain road engineering close in a couple of days. I believe India … Continue reading

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Document on road design standards by country

An update, version 5.2, of the publication “Road design standards” (of which I am the editor) is now available. You can find a link to a free copy of the document if you visit the home page at https://roaddesignstandards.wordpress.com The … Continue reading

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Simplification of standards (2)

Suppose someone does manage to list the features which influence- or are influenced by – a geometric parameter (see previous post here). This information by itself is not enough to allow anyone to simplify things. We would also need to … Continue reading

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