Neighbors kids running wild. Do I get involved or mind my own business?

Some new neighbors moved in down the street a few months ago. It's a married couple with 4 or 5 kids, all under 11. The older ones usually just ride their bikes up and down the block and entertain themselves. The problem is the youngest two kids. One child is probably 5 and the other is no more than two (still in diapers). These two kids are constantly wandering into the street and I feel it's only a matter of time before one of them is hit by a car.

There is no adult supervision ever. I think the older ones are supposed to be "watching" the younger ones, but that doesn't happen. I know what you're thinking- "Where are the parents?" I have no idea. Best I can tell is the dad isn't home a lot and the mom is out of fricks to give. I very rarely see either adult. I only know when they're home because they drive a massive van. I would talk to the parents about watching their kids, but they're from the Middle East and they don't speak English, or at least not well enough to carry out a conversation. Even the kids barely speak English, so telling them to watch their siblings, before one of them gets hit, has been a challenge. Short of physically moving these small children out of the street (I won't do that), what are my options? Call the cops (seems like a dick move)? I have no idea how to approach this issue, due to the language barrier. Should I just stay out of it and mind my own business?