Category Archives: road design

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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Inter-vehicle gap

The discussion on the longitudinal gap between vehicles is well-established; increased speed means increased gap. But this only covers the gap in the direction of travel. What information is there on the lateral gap – the one between vehicles at … Continue reading

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Turkish delight

In a recent post I expressed some doubt about the usefulness of the UK’s TD 9/93 (part of the “Design Manual for Roads and Bridges” (DMRB)). If any users of TD 9/93 also have some doubts, help may be available … Continue reading

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Parameters (2) road type

I began a discussion about fundamental parameters in highway geometric design recently. The first parameter in my list is road type.  A feature of “road types” is  that they are associated with specific details of highway geometric parameters in all … Continue reading

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Criticism of current standards

The authors Broeren, Uittenbogerd, Groot, Ruijs gave a paper at the ISHGD 2015 (5th International symposium on highway geometric design). The paper has the title “Insight in horizontal curves – fundamental research on behalf of the update of the Dutch … Continue reading

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Parameters (1) – fundamental parameters

I discussed the idea of many parameters in highway geometrics, in other blog posts, for example here and here. There are many different parameters involved in the design of a highway. So far I have a list of more than … Continue reading

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Road design – road types

In recent posts I have discussed the idea of the “technical environment” for road design. One of the seven technical factors which I suggest describe this environment is “road type”. 

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Road design – the technical environment

This is the second of three posts which refer to the presentation by Dr. John Rolt of the UK’s TRL (ref. 2211). Discussion It is easy to read through a document with road design standards, check out the values for … Continue reading

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Minimum horizontal radius (again)

I recently posted another update to my technical note on minimum horizontal radius (you can download a copy from Academia (here) and from ResearchGate (here)). Afterwards I came across a presentation by Dr. John Rolt, given in 2013 (?), on … Continue reading

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3D road design

Two authors from the National Technical University of Athens recently published a paper on 3D road design. You can find copies of the paper online. It is called”Three dimensional road design by applying differential geometry and conventional design approach criteria” … Continue reading

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