TfL are implementing a new system for the trams which will automatically apply the brakes when they exceeded the speed limit at high risk locations. This will improve safety for the Tram service in South London.
From TfL Press release
New system will automatically bring a moving tram to a controlled stop if exceeding speed limit at high risk locations.
TfL has begun the tender process for the installation of a new safety system on the London Trams network that will automatically apply the brakes should the speed limit be exceeded at high risk locations.