GPS-based traffic monitoring system

1. A method for providing traffic information, comprising:

maintaining a list of vehicles that are subscribers of said traffic information;

receiving vector and location data from a plurality of vehicles traveling on a first set of roads;

analyzing said vector and location data;

generating traffic reports based on said vector and location data;

transmitting said traffic reports to said vehicles that are subscribers of said traffic information;

diagnosing a possible problem with a first vehicle using said vector and location data;

using a remote service assistance system to contact said first vehicle when said vector and location data indicates said possible problem;

comparing a speed of one of said vehicles on a first road to a first threshold and to an average traffic speed on said first road; and

selectively contacting said vehicle using said remote service assistance system based on said comparison.

2. The method of claim 1 further comprising at least one of:

receiving requests for said traffic reports from said vehicles and transmitting said traffic reports to subscribers of said traffic reports; and

pushing said traffic reports to said subscribers.

3. The method of claim 1 further comprising billing said subscribers for said traffic information.

4. The method of claim 1 further comprising:

wirelessly transmitting said location and vector data when one of said plurality of vehicles is traveling on a first set of predetermined roads; and

not transmitting said location and vector data when said one of said plurality of vehicles is traveling on a second set of predetermined roads.

5. The method of claim 1 wherein said traffic report includes traffic speed information for traffic on at least one road of said first set of roads.

6. The method of claim 1 further comprising:

receiving parking data from said vehicles; and

generating parking status information for public parking spots based on said parking data.

7. The method of claim 6 wherein said parking status information includes at least one status type selected from a group consisting of leaving, filled, open and unknown.

8. The method of claim 1 wherein said vehicles transmit said vector and location data on a periodic basis.

9. The method of claim 1 further comprising:

monitoring changes in speed of said vehicle; and

transmitting said vector and location data when said vehicle speed change is greater than a speed change threshold.

10. The method of claim 1 further comprising:

maintaining a list of vehicles that are subscribers of parking status reports;

receiving location and parking indication data from said vehicles;

generating said parking status reports; and

selectively transmitting said parking status reports to said vehicles that are subscribers.

11. A method for providing parking information, comprising:

maintaining a list of vehicles that are subscribers of said parking information;

receiving parking indication and location data from a plurality of vehicles when said vehicles are parked in public parking spots;

generating parking reports based on said parking indication and location data;

transmitting said parking reports to said vehicles that are subscribers of said parking information;

selectively generating location and parking indication data when an engine of one of said vehicles is turned off; and

selectively transmitting said location and parking indication data.

12. A method for providing parking information, comprising:

maintaining a list of vehicles that are subscribers of said parking information;

receiving parking indication and location data from a plurality of vehicles when said vehicles are parked in public parking spots;

generating parking reports based on said parking indication and location data;

transmitting said parking reports to said vehicles that are subscribers of said parking information;

selectively generating location and parking indication data when an engine of one of said vehicles is turned off; and

selectively transmitting said location and parking indication data.

13. The method of claim 12 further comprising selectively transmitting parking indication and location data when one of said vehicles parks in a public parking spot.

14. The method of claim 13 further comprising transmitting vector and location data when said vehicle leaves said public parking spot.