A previous post (link) introduced the idea of a primary classifier for roads, and suggested it should be speed (probably design speed). The post suggested 14 classes, from class 130 (design speed 130 km/hr) to class 0 (design speed 0 km/hr).
Poland has a document (ref. 375) which describes a road classification which involves seven technical classess, numbered from technical class I to technical class VII (see ref. 375 – details below). The classes are:
- I – highways (A)
- II – expressways (S)
- III – speeded up roads (GP)
- IV – main roads (G)
- V – collector roads (Z)
- VI – local roads (L)
- VII – access roads (D)
The document identifies speed as one of the classification’s ‘key features’ (Podstawowe cechy) From (ref. 375) and my suggested primary classifier we can produce the following table:
Points worth noting:
- This classification only uses 8 of my 14 suggested classes.
- Technical classes I and II have the same speed groups – although there is a caveat about speed 80 in class I (and why not delete class II, since in the table it duplicates class I)
- Technical class III covers the biggest speed range, of 40 km/hr (from 60 km/hr to 100 km/hr). This range covers both urban and inter-urban roads – the dividing line is arguably a speed of 70 km/hr. Class III could be modified to form a new class II (80, 70 km/hr). The lower speeds of class III are already covered by class IV.
Too simplistic perhaps, but the technical classes might be further modified as shown in the table below:
(assumes the speeds in the source material refer to design speed)
375 – Generalna Dyrekcja Dróg Publicznych, “Wytyczne projektowania dróg WPD-1” (Warszaw 1995)