The NGT trolley scheme has traffic delay designed into it because of “traffic stacking”. All other traffic is halted by traffic lights while trolley buses move across the carriageway to turn onto the sections of the route that is dedicated to the trolley bus. The traffic stacking causes delay to buses by making them wait at traffic lights. There will be least 5 of these traffic-stacking points, in both directions, on the way to Bodington Hall. These are at, Woodhouse Moor (Library), Hyde Park junction, Headingley Hill (top), Shaw Lane/Alma road junction, and the Lawnswood roundabout. All other traffic including commercial vehicles, bicycles, cars, cabs, are in the stack. I don’t know what happens to emergency vehicles. The diagram below is complicated but it is the best effort to explain the system in the light of the lack of information from the NGT proposers.
The core of the system is a small transponder or tag that can be attached into each trolley bus. To interrogate, a reader sends out a radio signal to the transponder via an antenna. The signal carries enough energy to reach a detector. The transponder then returns a signal that carries the data that it is storing. This data has a unique, programmed pin. When a trolley bus is detected approaching the stack the lights change in its favour. Nearly all our buses already carry them and mobile technology tells the operator where the vehicle is. It also alters the fare stage on inboard machines and accumulates statistics for route planning.