Looks to be (S. vanhouttei), the classic bridal wreath spirea.

Here's a close-up.

I just might have to take my response back and rethink.

I'm thinking Spiraea cantoniensis.

note the poor planting site decision .. just a minor fact that it is covering the sidewalk and forcing peeps to walk in the road.. at what looks like a school no less .. crikey ...

some real zen master choose that spot.. lol ..

if you likey ... either give it the space it needs.. or learn how to tame it properly ...

ken

The previous owner of the house planted it. I keep it pruned back from the road and it's only going about 6" over the flared apron of the driveway. There is no sidewalk. It's a very narrow road with all of five houses on it. And that's not a school. I agree it's overgrown in that space and one day I will have to remove it, but for now careful pruning keeps it out of everyone's way way.

Thanks so much for your very helpful reply.