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Actually TfL:
are responsible for the maintenance, management and operation of the Capital's 6,000+ sets of traffic lights
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Our traffic controllers are able to change the length of time a light is green or red to clear an unexpected queue and control vehicles moving into an already congested area.
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We use SCOOT (Split Cycle Offset Optimisation) technology at 75% of our traffic lights. This uses sensors in the road to detect vehicles and uses the information to automatically respond to changes in traffic conditions.
chez_jay
Generally speaking yeah, TfL's red routes and the local councils yellow lines. TfL have also taken control of a handful of junctions traffic lights on top of that as they feel they are strategic and can impact the traffic so much it's worth incorporating them into the systems they have which can speed up/slow down the rate of drivers. In some areas cycle routes will also be blue for TfL backed/funded cycle super highways while council maintained ones will be green or sometimes red.