We've discussed implementing an anti-ram circuit on our bot using IR, ultrasonic, or another 'proximity' sensor to monitor the closure rate and just preventing our bot from being able to committing them.
Prevention instead of detection. The big problem we had was coming up with the metrics to define high speed ramming, but I hear that IRI uses > 8ft/s for more than 2 bot lengths. It doesn't help you argue if someone rams you, but it simplifies one more thing for the driver that can get you into trouble.
<sucking up>
The planning committee for IRI really seems to be quite wise with a solid ramming definition like this. Hey, haven't they been using a yellow/red card system for a few years? What other wisdom (i.e. awesomeness) do they have to share with us this year? I hope I get to find out.
</sucking up>
Mark