I'm not planning on making one, but I was curious how one would go about making a speed bump (say for a private company parking lot.) Is this a project that is best left to the professionals or a quick weekend project some good friends could help with?
No. Tap-a-line fittings are designed for copper tubing. Braided lines should never be punctured. The good news- there is a fitting designed for your application. You want a compression tee with a 1/4 in branch for your icemaker line. Visit a local plumbing supply shop or hardware store (not the orange or blue know nothing stores) and explain your situation. You might even consider a braided line for the icemaker supply if it is not too far away.
Yes, I believe they are still here with us too. I've only had personal experience with Artemis, but I believe the others more than likely are around too.