Friday 26 June 2015 11.09pm
Thanks JonR, so are they to stop trucks, lorries etc from knocking over the traffic signals and if so why/how would they hit them? Unless they were reversing perhaps.
These poles are not set in the ground because they are temporary and will only be up for the duration of the roadworks.
If the top of a pole (where the traffic lights and signage are located) is heavier than a base not anchored into the ground, it will fall over.
To avoid this, the base must be significantly heavier than the top.
This explains why the poles temporarily sit in large concrete containers.
They are painted white and red to make them more visible to the public so as to avoid a potential trip hazard, and are not designed to withstand the impact from a moving vehicle.
When a car strikes a permanent pole embedded into the ground this is what usually happens: