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Learning from Road Layouts

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Written By asj - 4 October, 2008

Traffic Bangalore Roads Pune Mumbai Analysis flow markings entropy signs

Dear All,

I have for some time wanted to share how planning road layouts is vital for ensuring traffic flows smoothly.

Here is the first in what I hope to make a series (and hope other contribute too) of road layouts from UK. Aim is to share these observations with our planners to reduce entropy on our roads.

A Typical cross junction in UK

Layout example 2: A typical T' Junction

Example 3: Layout of pedestrian zebra (without traffic lights) at a T-junction. The layout automatically makes the zebra more than just a pedestrian crossing, it becomes a tool for regulating traffic, allowing vehicles either joining or leaving the main road safely when traffic waits to let pedestrians cross safely - want to see a video example? My video on Zebra belongs to pedestrians has an example, wait till you see the bus stopping for pedestrian at the zebra and see how it gives a chance for another vehicle to safely cross over to a side lane.

ASJ

Case example 4: A typical roundabout, again pedestrian zebra crossings without any traffic lights help regulate the traffic (along side the right of the way rules of a roundabout).

COMMENTS

Signal Free Roads - Do you mean junction free roads?

asj - 21 October, 2008 - 06:37

Signal Free Roads - Do you mean junction free roads? I have tried to imagine now for some hours how this will work. The only way it will work is if we had roads that did not meet each other and consequently there were no junctions. It seems impossible and unrealistic. Refer you to discussion on freeways are freeways and city roads are city roads (sorry can't find it quickly enough to insert the link here) ASJ

Road Layout Example 5: T Junction's and Right of the Ways

asj - 11 October, 2008 - 19:02

Here is example 5 showcasing how clear road markings and signage removes conflict, establishes right of way and hence reduces entropy.

ASJ

More road layouts: Bus Bays, Major cross junction and U turns

asj - 12 October, 2008 - 15:02

Ok, these are case examples 6 to 8.

First, example 6, looks at bus bays

Example 7 - is a major crossroads or intersection on a 6 lane dual carriageway - note the similarities with example one at the top.

Example 8 - same dual carriageway but a demonstration of how a conflict free U turn facility is provided

ASJ

Case example 9: Road typology

asj - 12 October, 2008 - 15:18

UK has a clear road typology, this helps planning and implementing layouts and safety measures for the given function of the roads in keeping with vehicle and pedestrian density.

ASJ

Yellow boxes in bangalore

idontspam - 26 October, 2008 - 07:10

We have yellow boxes at some jn's in Bangalore, but everybody thinks its rangoli to beautify the jn and was done so as not to waste the extra paint left over with the painters. Most of the yellow boxes not got asphalted over and dont exist anymore.

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