An easy to make Lego stop light. You will need. The only pieces who's colors are important are the green, yellow, red, and the two white pieces. The others make up the poll/support and can be what ever color you prefer.
-1 4x4 red piece
-1 4x4 yellow piece
-1 4x4 green piece
-2 8x2 thin white piece
-1 10x2 thin piece
-1 8x2 piece
-1 4x1 piece
-1 4x2 piece
Step 1: Step 1
Take the 4x2 block, this will be the base.
Step 2: Step 2
Then place the 4x1 piece on the 4x4.
Step 3: Step 3
Then take the 6x2 piece place it in the center of the 4x4 block, I used blue but the color here doesn't matter.
Step 4: Step 4
Then take a 10x2 thin piece and over lap a 4x4 space on the back of 6x2. So that it stands straight up.
Step 5: Step 5
Then take your 2 8x2 thin pieces and place them on the front of the 10x2 so that they are side by side and cover the back 10x2 piece.
Step 6: Step 6
Then take the final pieces and make it look like a stop light. Leave a space around the 4x4 edge then cascade the green yellow then the red as shown in the picture.