So I've read on here several times that many track racers use clipless shoes and pedals with clips and straps (yes, I know the naming is paradoxical). I have two questions about this.

1. What kind of pedals/shoes are they using that allow you to also use clips and straps?
2. If I were to get those pedals with some clips and straps, would I be able to use them safely with street shoes if need be?

To me that kind of set up sounds like a win/win situation. If I want to go out and do some serious biking I could use clipless shoes. If I'm just riding a mile or two or plan on doing a lot of walking I could stay in street shoes. I have a feeling if it's that simple a lot more people would be doing it though