Cook the pasta according to package directions, minus added salt.
Preheat oven to 450 degrees.
Wash all vegetables and garlic before chopping.
In a medium bowl, toss squash, zucchini, bell pepper and onion with half of oil (2 tablespoons) in a large roasting pan or a large baking sheet with sides.
Season with salt and pepper.
Place the vegetables in a preheated oven. Stir the vegetables every 5 minutes, until tender and browned for about 10 to 20 minutes.
Meanwhile, combine basil, garlic and remaining oil (2 tablespoons) in a large bowl.
Combine pasta, vegetables and dressing in a large bowl; serve warm.