Robocup Jr Rescue

[Sylvestre]

Hello everyone,

I am participating in a competition called Robocup Jr Rescue.  I'm sure many of you have heard of it.  For those who have, I have a few questions and am looking for some advice and words of wisdom.   I have to create an autonomous robot using the Lego RCX kit.

If you don't know and want to learn more about Robocup, you can Google 'Robocup Jr Rescue'

Which would benefit me more, one or two light sensors?
Would it be beneficial to have more than one impact sensor on multiple sides of the robot, not just the front?
Also are there any problems I may not foresee right now (still in design process/ problem formulation)

Thanks