One feature lacking on the Model S is a front collison detection system. A fellow member on this site informed me of an add-on product made by Mobileye. Their C2 model has been interfaced to several Model S cars. Mobileye is also in discussions with tesla engineers to obtain additional information that would allow them to install their model 560 device (the model 560 requires digital input signals in addition to analog signals, thus allowing more features to be offered). Mobileye told me they hope to have the necessary information within the next 30 days.
A friend of mine told me about a collision avoidance app available for android phones and the iphone. The android version is currently free. The iphone version costs $1.99. I purchased the app to test. However, the app requires that you install the phone in a holder that attaches to the windshield, so that the phone can be properly oriented, and I do not have such a holder. The name of this app is IONROAD. The press on the app looks good. Does anyone have any experience with this app? I sent the maker of the app an email asking whether they had any plans to offer an app for the Tesla in the future (I would think all it would need is a front camera, as the processing could be done by the processor in the touchscreen). Unfortunately, they told me that they are currently concentrating on the smartphone market. Maybe if enough people contact them, they may reconsider.