project on accident detector

using Arduino and GSM shield and GPS to accomplish that.

description of work : The Arduino should sense the impact of a car accident using pressure sensor. At the exact impact the Arduino should send message to a phone number using SMS that an accident has occurred and also a GPS should keep track of the position of the vehicle and send its location to the website(internet).

Please if the accident occurs the phone and the web are aware ( messages a been seen to them at the same time).

The GPS keeps track of the car whether there is accident or not. - IF THERE IS AN ACCIDENT, THE GPS MESSAGE TO THE WEBSITE SHOULD BRING RED AND ITS LOCATION. - IF NO ACCIDENT, THE GPS SHOULD DISPLAY GREEN BEEP ON THE WEBSITE. BUT THE GPS TRACKS THE CAR THAT ALL SITUATION.EVEN WHEN IT MOVES OR STOP.

Please I need your help on what to do thanks. what to components to use and sensors.

moderator: added line breaks to make it more readable

Where does the website come into this development ?