Classifications

• • G—PHYSICS
  • G08—SIGNALLING
  • G08G—TRAFFIC CONTROL SYSTEMS
  • G08G1/00—Traffic control systems for road vehicles
  • G08G1/09—Arrangements for giving variable traffic instructions
  • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
  • G08G1/0965—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages responding to signals from another vehicle, e.g. emergency vehicle

Definitions

• This invention relates to a system for warning of traffic incidents, especially the approach of emergency vehicles .
• sirens are often used to warn a nearby driver of a possibly dangerous situation.
• an approaching emergency vehicle such as an ambulance.
• the ambulance is delay, with possible fatal results.
• dangerous traffic conditions may arise where an unwarned driver obstructs an emergency vehicle which is often travelling at high speed.
• Several systems have been suggested in order to warn the drivers of a dangerous situations in the traffic, many of them comprising radio transmitters positioned in an emergency vehicle.
• Receivers adapted to detect the generated signal are provided in ordinary vehicles, so that the receiver may generate a signal warning the driver. Examples of such systems are described in the following patents: US 4,238,778, US 4,403,208, and US 4,764,978.
• It is an object of this invention to provide a system for warning of traffic incidents comprising a radio transmitter adapted to be positioned in a first vehicle and a radio receiver adapted to be positioned in second vehicle, characterized as described in claim 1.
• the invention provides a system for transmitting signals from e.g. an emergency vehicle to a driver using radio signals, but without occupying a radio frequency, as the pulsed signal does not disturb normal radio signals. This way the same frequency range may be used everywhere, making both the transmitters and the receivers simple and possible to produce at low costs.
• the frequency of the signal generated by the oscillator may be chosen from a wide range. In a preferred embodiment the frequency is approximately 750MHz.
• control units and the detector described here comprises electronic circuits for time measurements and possibly counting of pulses. These circuits are well known and commercially available, and the exact embodiments of them are not essential to this invention.

Landscapes

• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Alarm Systems (AREA)
• Circuits Of Receivers In General (AREA)
• Emergency Alarm Devices (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19901431

Family Applications (1)

Country Status (6)

Families Citing this family (4)

Family Cites Families (4)

• 1997
  • 1997-12-10 NO NO975802A patent/NO975802A/no not_active IP Right Cessation
• 1998
  • 1998-10-05 AU AU94664/98A patent/AU9466498A/en not_active Abandoned
  • 1998-10-05 EP EP98947994A patent/EP1046149A1/de not_active Withdrawn
  • 1998-10-05 WO PCT/NO1998/000299 patent/WO1999030303A1/en not_active Ceased
  • 1998-10-05 BR BR9813457-4A patent/BR9813457A/pt not_active Application Discontinuation
  • 1998-10-05 JP JP2000524780A patent/JP2001526434A/ja not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events