Mean Streets is the first map that the player must beat in SAS: TD.
Layout[]
The beginning of the map is at the bottom left, and is where all of the Zombies come from. They come from the left, where there are two sandbags, and continue to turn and go up, where they then again go and turn right. They continue to where they turn up at the two cars. Then, after going over them, they continue onward to where they turn down, and then to the left, where they make a sharp turn down. This is where they exit the map.
Strategies[]
You are able to sell the sandbags in the bottom left corner at the start. Although it only gives around 20 dollars for both of them (as they sell for around 10 dollars,) it can be a decent way to benefit your cash gain.