A reasonably reliable distance sensor with 10m range?

[Alan Anderson]

Originally Posted by theprgramerdude

Edit: If you're really concerned about interference, then consider placing two, or even three, sensors to do the same job spaced across the robot. The multiple sensors will serve as an easy form of error detection in the event that interference is experienced.

Or the multiple sensors will interfere with each other and make the problem worse. If you really want to run several ultrasonic sensors, you're probably going to want to wire them so they aren't all pinging simultaneously.