It helps if you drive a nice car, or a convertible. Make sure your car is washed no matter what it is.
I actually drive a black Honda s0000 (convertable) and yes, it can be done. One Friday night me and a friend were crusin around and I pulled up next to 2 girls at a stoplight and the conversation went something like this:
(her windows were already down)
Me: You couldn't find anything better to do on a Friday night?
Her: haha, looks who's talking
Me: Your car looks like a black person's car!
Her: What! It does?!
**The light turns green**
Me: Hey, pull into WalMart!
I didn't think she would, but she follows me into the Wal-Mart parking lot, we chit-chat for a bit, exchange names etc... It turns out she was like 8 years older that me and not really quite as hot as I prefer, plus she was on her way home, so we both parted.
So yeah, if you have a hot car it's a piece of cake. I get people yelling at me from across the highway saying stuff like "Hey! What are you doing tonight!?", so yeah, when at a light, it's a piece of cake.