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This classification basically depends upon speed limits, signal density,
driveways / access point density etc.
- High speed
- Suburban
- Intermediate
- Urban
These are the streets with very low driveway or access point density.
These are provided with separate right turn lanes and; no parking is permitted
on street.
Streets may be multilane divided or undivided or two lane facility with
shoulders.
Signals are infrequent and spaced at long distances.
Road side development is very low.
A speed limit on these roads is 75 to 90 kmph.
They represent streets with a low driveway/access-point density,separate or
continuous right turn lane and some portions where parking is permitted.
These roads possess comparatively higher density of roadside development than
that on high speed streets.
It has about three signals per Km. and speed limit on these roads is 65 to 75
kmph.
They represent urban streets with moderate driveway/access point density.
Like sub-urban streets they also have some separate or continuous right turn
lane and some portions where parking is permitted.
These roads possess comparatively higher roadside development than that on
sub-urban streets.
It has about two to six signals per Km. and speed limit on these roads is 50 to
60 Kmph.
They represent urban streets with high driveway/access point density.
These are usually provided with road side parking.
It has highest road side development density among all above stated four
classes.
Signal density is about four to eight per Km.
Speed limit is 40 to 55 Kmph.
This type of classification considers for combination of functional and design
classes divided into four classes viz. I, II, III, IV which reflects a unique
combination for of street function and Design, as shown in table 1 and related
signal densities are shown in table 2.
Table 1:
Combined classification of urban streets
| Design category |
Functional category |
| |
Principal arterial |
Minor arterial |
| High speed |
I |
NA |
| Suburban |
II |
II |
| Intermediate |
II |
III or IV |
| Urban |
III or IV |
IV |
Table 2:
Specifications of street classes
| Urban Street Class |
Signal density |
Free flow |
| |
(signals/km) |
speed(kmph) |
| I |
0.2 |
80 |
| II |
2 |
65 |
| III |
4 |
55 |
| IV |
6 |
45 |
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