In the Netherlands, traffic lights have to comply with the rules in the Traffic Lights Regulation (Regeling verkeerslichten). The regulation sets guidelines regarding the use, design, placement, colour, measurements, and material for the different types of traffic lights.
The regulation also specifies the frequency of flashing of traffic lights and, if acoustic signs are present, the type of sound and the sound level.
Please note: The technical requirements that apply in the Netherlands to traffic lights differ from those of other EU Member States. If a type of traffic light is already permitted in another EU Member State, the Dutch government may only prohibit its sale in the Netherlands in exceptional cases.