Author Archives: roadnotes

About roadnotes

Robert Bartlett is an international consultant with over 30 years of professional experience as a highway and traffic engineer with leading companies and organisations in several countries, including Germany, China (Hong Kong), Qatar and the UK. Specialised in urban studies, transport and the use of GIS, research has included new ideas on subjects such as the study of social justice using GIS, the dimensions of vehicles, and comparative geometrics (highways and transport).

Bike lanes (4) definitions

You might think that it would be possible to get a general understanding of bike lanes if you start by checking out definitions of what they are. There are problems with this: even if we only look at documents which … Continue reading

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Bike lanes (3) – design zones

I am aware of the desire for three- or four-dimensional road design as opposed to the more conventional approach of designing separately for horizontal alignment, vertical alignment, and the cross-section(s). However it does help to picture the road in two … Continue reading

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Bike lanes (2) “style sheets”

In the previous post on bike lanes I said that it would be good to prepare an overview of cycle lanes, so that designers can pick the design best suited to their project; and I suggested that tThere are at … Continue reading

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Bike lanes (1) a structure of types

Bike lanes – in the general sense of “road space for use by cyclists” – have been around for quite a while. There is a Wikipedia article on the history of cycling infrastructure which says: “The history of cycling infrastructure starts from shortly … Continue reading

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UK new road design standards

Highways England recently announced they are to release an updated set of road design standards in 2018 which will be used across the United Kingdom. https://www.gov.uk/government/news/first-glimpse-of-updated-road-design-manual-in-2018

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Design standards

A textbook on highway engineering once said that there are three topics to consider in road design: the vehicle, the user and the road. We can add two more to this list: Road standards – There are very many of … Continue reading

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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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Chile’s Road design manual updated

Chile’s Roads Department, part of the Ministry of Public Works, has just updated its Manual de Carreteras. The documents can  be downloaded free of charge from http://mc.mop.gov.cl/Login.aspx (but you need to register and log in).

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60 mile/hour speed limit?

Around four years ago I wrote that, according to an article in the UK’s Daily Mail (see here), the British government had plans to increase the speed limit on motorways from 70 mile/hr to 80 mile/hr (from 112 km/hr to … Continue reading

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“Findability” and road design standards

I have just published some notes on “side friction”, which you can download (for example) from Academia. The document has a “discussion” section which in part looks at how current design standards fail their users. Examples of these failures include … Continue reading

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