So far I have discussed the concept of fundamental parameters in highway geometric design (for example, here) and the fundamental parameter “road type“. This post covers the fundamental parameter “vehicle type“. Vehicle type relates directly to design vehicles – the … Continue reading
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
Other complications with standards Layout One problem with some standards is not the format – pdf or paper for example -but that you have to search backwards and forwards through many pages of the document before you find all the … Continue reading
The US organisation NACTO is preparing a “Global Street Design Guide (GSDG)”. The NACTO project page (see here) says that this: “… will be a timely resource that will set a global baseline for designing streets and public spaces while … Continue reading
A control line is an imaginary line along a design for a new road. For example, (Ref. 2133) says that “The horizontal and vertical elements of a road are described in terms of control lines. Control lines are lines mathematically … Continue reading
This is the first of a short series of (short) posts on a new road classification.
I suspect that one of the differences between engineering and science is that science tends to claim precision, whilst engineering involves an element of pragmatism. For example , any highway design manual which quoted friction values to 3 decimal places … Continue reading