On 03-Jan-17 8:03 AM, harry wrote:
https://www.youtube.com/embed/UEIn8GJIg0E?rel=0


It works mainly because the traffic density is relatively low for that
width of road. The crossing traffic also gets occasional periods when
the junction is completely clear since the up/down traffic arrives in
waves. A set of traffic lights are obviously controlling its arrival
from the distant junction and the same is probably true for the traffic
travelling up the screen.

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Colin Bignell