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Arriva North-East DAF SB3000 buses (Plaxton Supreme coach-bodied) were fitted with 'idiot lights' (a string of LEDs that illuminated sequentially from green through yellow to red - several of each colour) that were supposed to indicate when drivers were operating economically (or uneconomically).
Some drivers kept the LEDs out of the reds as much as possible whilst others considered the system as a waste of time.
All these DAFs had their revcounters disabled, so it might have been that the LEDs were triggered from the revcounter feed, or from the throttle pedal position.
These DAFs (they were R-registered) have now been replaced by Scania Omnicity 07-registration buses as the DAFs were increasingly unreliable and resulted in a public outcry from passengers who were experiencing frequent delays and cancellations.
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