System and apparatus for road traffic congestion degree estimation

• US 20060064236A1
• Filed: 09/20/2005
• Published: 03/23/2006
• Est. Priority Date: 09/21/2004
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Hayashi, Kazumi
• Application Number:
  US11/231,080
• Publication Number:
  US 20060064236A1
• Time in Patent Office: Days
• US Class Current: 701/117
• CPC Class Codes: G08G 1/0104 Measuring and analyzing of parameters relative to traffic conditions
• CPC Class Codes: G08G 1/017 identifying vehicles G08G1/015, G08G1/054 take precedence

Abstract

A road traffic congestion degree estimation system includes smart plate readers that detect vehicles driven on a general road externally leading to a resort. The numbers of local vehicles and strange vehicles that currently exist in the resort are calculated, based on the number of vehicles approaching the resort, the number of vehicles receding from the resort, and information of smart plates of the detected vehicles. Furthermore, a prospective degree of traffic congestion on an expressway, which introduces the strange vehicles receding from the resort via the general road into areas where the strange vehicles are based, is estimated based on the above calculated numbers of local vehicles and strange vehicles. In this estimation, the number of strange vehicles contributes more greatly to an increase in the degree of traffic congestion than the number of local vehicles does.

Claims

1. A road traffic congestion degree estimation system comprising:

vehicle sensing means that detects a vehicle which is driven on a first road extending between a first area and an outside of the first area;

calculating means for calculating a number of local vehicles that are based in a second area including the first area and that currently exist in the first area and a number of strange vehicles that are based in an outside of the second area and currently exist in the first area, based on a number of approaching vehicles driven in a direction of approaching the first area and a number of receding vehicles driven on the first road in a direction of receding from the first area, wherein the number of approaching vehicles and the number of receding vehicles are included in a number of vehicles detected by the vehicle sensing means;

estimating means for estimating a prospective degree of traffic congestion on a second road, which extends from the second area to the outside of the second area and introduces a vehicle coming from the first area into the outside of the second area, based on the calculated number of strange vehicles and the calculated number of local vehicles, wherein the number of strange vehicles contributes more greatly to an increase in the degree of traffic congestion than the number of local vehicles contributes; and

storage control means for storing data, which specifies the estimated degree of traffic congestion, in a storage medium.

2. The road traffic congestion degree estimation system according to claim 1,

wherein the vehicle sensing means acquires pieces of information on number plates of the approaching vehicles driven on the first road and the receding vehicles driven on the first road, and

wherein the calculating means checks information on a place name, which is contained in the information on a number plate detected by the vehicle sensing means, to see whether a vehicle detected by the vehicle sensing means is a local vehicle or a strange vehicle.

3. The road traffic congestion degree estimation system according to claim 1,

wherein the vehicle sensing means includes a plurality of vehicle sensors that are installed on the first road, and

the calculating means checks an order in which the plurality of vehicle sensors detect a vehicle to see whether the vehicle is an approaching vehicle approaching the first area or a receding vehicle receding from the first area.

4. The road traffic congestion degree estimation system according to claim 1,

wherein the vehicle sensing means acquires information on a direction of drive in which a vehicle is driven on the first road or information on a scheduled drive route from a communication device mounted in the vehicle;

and

the calculating means checks the acquired information on a direction of drive or the acquired information on a scheduled drive route to see whether the vehicle is an approaching vehicle approaching the first area or a receding vehicle receding from the first area.

5. The road traffic congestion degree estimation system according to claim 1, further comprising:

number-of-overnight vehicles calculating means for calculating numbers of strange vehicles and local vehicles which visit an accommodation facility located in the first area,

wherein the estimating means estimates the prospective degree of traffic congestion on the second road based on the calculated numbers of strange vehicles and local vehicles that visit the accommodation facility.

6. The road traffic congestion degree estimation system according to claim 5, further comprising:

a parked vehicle sensor that detects vehicles parked in the accommodation facility located in the first area and acquires pieces of information on number plates of the parked vehicles,

wherein the number-of-overnight vehicles calculating means calculates the numbers of strange vehicles and local vehicles, which visit the accommodation facility in the first area, based on a number of parked vehicles detected by the parked vehicle sensor and the acquired pieces of information on the number plates of the parked vehicles.

7. The road traffic congestion degree estimation system according to claim 5, further comprising:

a tag reader that is installed in the accommodation facility and that acquires pieces of information on number plates of vehicles from handheld tag devices in which the pieces of information on number plates are preserved,

wherein the number-of-overnight vehicles calculating means calculates the numbers of strange vehicles and local vehicles, which visit the accommodation facility, based on a number of vehicles identified with the acquired pieces of information on number.

8. The road traffic congestion degree estimation system according to claim 5, further comprising:

receiving means for taking a reservation for accommodation at the accommodation facility, and receiving information on an area, where a vehicle associated with the reservation for accommodation is based, from a tied server that transmits the information on an area over a communications network,

wherein the number-of-overnight vehicles calculating means calculates a numbers of strange vehicles and local vehicles, which visit the accommodation facility, based on the received information on an area.

9. A road traffic congestion degree estimation apparatus able to communicate with vehicle sensing means that detects a vehicle which is driven on a first road extending between a first area and an outside of the first area, the road traffic congestion degree estimation apparatus comprising:

calculating means for calculating a number of local vehicles that are based in a second area including the first area and that currently exist in the first area and a number of strange vehicles that are based in an outside of the second area and currently exist in the first area, based on a number of approaching vehicles driven in a direction of approaching the first area and a number of receding vehicles driven on the first road in a direction of receding from the first area, wherein the number of approaching vehicles and the number of receding vehicles are included in a number of vehicles detected by the vehicle sensing means;

estimating means for estimating a prospective degree of traffic congestion on a second road, which extends from the second area to the outside of the second area and introduces a vehicle coming from the first area into the outside of the second area, based on the calculated number of strange vehicles and the calculated number of local vehicles, wherein the number of strange vehicles contributes more greatly to an increase in the degree of traffic congestion than the number of local vehicles contributes; and

storage control means for storing data, which specifies the estimated degree of traffic congestion, in a storage medium.