Ok. Firstly, you need to include pictures of your map. I think the map looks pretty good (albeit a bit simple) but others won't know what it looks like. On to my actual opinions:
Theme: the theme is good. I don't know of any traffic light maps, so good job.
Build: The build is nice. I think the shape and proportions are good, but the block variety is a little bit lacking. I think mixing in other black blocks like coal blocks and obsidian into the black wool would make the map much better looking. You can do this with worldedit using this command: //replace 35:15 33%35:15,33%49,34%173 . Also, change the heads and fences in the build to a lighter color, they are really hard to see and ruin the experience a little.
PK: The pk is good. My only problem is it feels a little easy for hard, as well as there being few checkpoints. If you added 1-2 more checkpoints and made the jumps harder, the map would feel much better. Other than that, there is good variation and the length fits the difficulty.
Overall, I think the map is pretty good. Some polishing could be done, but that's just my opinion.