G PHYSICS
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G08 SIGNALLING
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G08G TRAFFIC CONTROL SYSTEMS
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G08G1/00 Traffic control systems for road vehicles
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G08G1/09 Arrangements for giving variable traffic instructions
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G08G1/0962 having an indicator mounted inside the vehicle, e.g. giving voice messages
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G08G1/0967 Systems involving transmission of highway information, e.g. weather, speed limits
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G08G1/096766 where the system is characterised by the origin of the information transmission
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G08G1/096775 where the origin of the information is a central station
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