I have covered IF statements in a few topics, I'll list them in a sec. But to answer this question is very simple;

First you need to make sure you have the camera control set up for colour detection, this will give ARC the global variable called $CameraObjectColor

Then your script would need the following IF statement

IF($CameraObjectColor = "Red")
  Stop()
ELSEIF($CameraObjectColor = "Green")
  Forward()
ELSE
  # Neither colour detected
  Print("No colour detected, awaiting colour to proceed")
EndIf

Here are the topics I mentioned which may be of benefit to read through.

If ElseIf Else Got & Return

An Introduction To Scripting

I've also posted a few other scripts which use IFs, my Ping Roam has a lot of IF statements. As do most of my files on the EZ-Cloud

Thanks! I will test that out.

There are dozens of example projects in ARC that demonstrates everything.

1. Start ARC

2. Press OPEN file the FILE menu

3. Press the EXAMPLES button

You will now see sub directories for SCRIPT examples and FUNCTION examples

I still keep forgetting about the examples already in ARC, must remember next time

Thanks for the help! I am excited to test it out!