I drive up the 404 3-4 times a week. If you have never seen a raptor OR you want the opportunity to look at a raptor when its close to the ground, I would suggest the Buttonville airport as the best place (but not necessarily the safest!) to go.
When you drive north on the 404 and approach the fenced part of the Buttonville airport, keep your eyes peeled - in fact, you probably don't have to look too hard. The raptor is usually sitting on the 5 foot high fence, looking for a snack. Today, he was just beyond the airport (closer to the Elgin Mills exit) sitting on top of the lightpost. Two days ago, i saw him on a horizontal tree branch, 100% exposed and easy to see. The branch was about 10-15 feet in the air. Three days ago, he was standing on the airport exit sign right on the shoulder of the road. on my way home, another raptor was across the street on another sign.
The biggest hazzard? If you want to see the bird, you have to pull over onto the shoulder of the highway - not recommended when its busy!
But I haven't been able to identify the bird. I THINK its a merlin, but cannot tell. If you have seen it and know what it is, can you let me know? Thanks