7. __ used on the waterways are like the turn light indicators used to signal intentions on the highways. a sound signals b lateral markers c colors

## Step 1<br />The problem is asking us to identify what is used on waterways to signal intentions, similar to how turn light indicators are used on highways. The options provided are sound signals, lateral markers, and colors.<br /><br />## Step 2<br />We need to consider the context of the problem. The problem is about signaling intentions on waterways, which is a visual activity. Therefore, we can eliminate sound signals as they are auditory and not visual.<br /><br />## Step 3<br />Lateral markers are used to indicate the right or left side of a waterway, but they do not signal intentions. Therefore, we can eliminate lateral markers as well.<br /><br />## Step 4<br />Colors are used on waterways to signal intentions, such as whether a boat is going to the left or right, or whether it is safe to pass or not. Therefore, colors are the correct answer.