GPS-based traffic monitoring system

1. A traffic monitoring system, comprising:

a traffic estimating module that estimates an average traffic level on a road during prior ones of first periodic periods;

a traffic monitoring module that estimates a current traffic level on said road during a first portion of a current one of said first periodic periods based on vector and location information received from at least one of cellular phones and vehicles during said first portion; and

a traffic predicting module that predicts traffic levels on said road during a remaining portion of said current one of said first periodic periods based on said average traffic level and said estimated current traffic level during said first portion.

2. The traffic monitoring system of claim 1 further comprising:

a cellular phone including:

a global positioning system (GPS) that selectively generates vector and location data;

a transmitter; and

a control module that selectively wirelessly transmits vector and location data of said cellular phone using said transmitter.

3. The traffic monitoring system of claim 2 wherein said control module transmits said vector and location data of said cellular phone when said cellular phone is traveling on a first set of predetermined roads and does not transmit said vector and location data when said cellular phone is traveling on a second set of roads.

4. The traffic monitoring system of claim 2 wherein said control module transmits said vector and location data of said cellular phone when said cellular phone is traveling at a speed greater than a first threshold and does not transmit said vector and location data when said cellular phone is traveling at a speed that is less than said first threshold.

5. The traffic monitoring system of claim 2 further comprising:

a traffic report generator that generates traffic reports based on said vector and location data, wherein said cellular phone includes a receiver that communicates with said control module and that wirelessly receives said traffic reports.

6. The traffic monitoring system of claim 5 wherein said traffic reports include traffic speed information for traffic traveling on at least one road.

7. The traffic monitoring system of claim 1 further comprising:

a cellular phone; and

a cellular phone tracking module that generates vector and location data for said cellular phone.

8. The traffic monitoring system of claim 7 wherein said cellular phone tracking module compares a speed of said cellular phone on a first road to a first threshold and to an average traffic speed on said first road and that selectively triggers contact with said cellular phone.

9. The traffic monitoring system of claim 2 wherein said control module transmits said vector and location data on a periodic basis.

10. The traffic monitoring system of claim 2 wherein said control module monitors changes in direction of said cellular phone and transmits said vector and location data when said cellular phone changes direction greater than a direction change threshold.

11. A method for operating a traffic monitoring system, comprising:

estimating an average traffic level on a road during prior ones of first periodic periods;

estimating a current traffic level on said road during a first portion of a current one of said first periodic periods based on vector and location information received from at least one of cellular phones and vehicles during said first portion; and

predicting traffic levels on said road during a remaining portion of said current one of said first periodic periods based on said average traffic level and said estimated current traffic level during said first portion.

12. The method of claim 11 further comprising:

providing a cellular phone including:

a global positioning system (GPS) that selectively generates vector and location data;

a transmitter; and

a control module that selectively wirelessly transmits vector and location data of said cellular phone using said transmitter.

13. The method of claim 12 further comprising:

transmitting said vector and location data of said cellular phone when said cellular phone is traveling on a first set of predetermined roads; and

not transmitting said vector and location data when said cellular phone is traveling on a second set of roads.

14. The method of claim 12 further comprising:

transmitting said vector and location data of said cellular phone when said cellular phone is traveling at a speed greater than a first threshold; and

not transmitting said vector and location data when said cellular phone is traveling at a speed that is less than said first threshold.

15. The method of claim 12 further comprising:

generating traffic reports based on said vector and location data; and

wirelessly receiving said traffic reports at said cellular phone.

16. The method of claim 15 wherein said traffic reports include traffic speed information for traffic traveling on at least one road.

17. The method of claim 11 further comprising:

providing a cellular phone; and

providing a cellular phone tracking module that generates vector and location data for said cellular phone.

18. The method of claim 17 further comprising:

comparing a speed of said cellular phone on a first road to a first threshold and to an average traffic speed on said first road; and

selectively triggering contact with said cellular phone.

19. The method of claim 12 further comprising transmitting said vector and location data on a periodic basis.

20. The method of claim 12 further comprising:

monitoring changes in direction of said cellular phone; and

transmitting said vector and location data when said cellular phone changes direction greater than a direction change threshold.