What suffix is used for streets running east and west, halfway between established grids?

The correct suffix for streets running east and west, especially when referring to those situated halfway between established grids, is indeed "Place." This designation is commonly used in urban planning and development to create a distinction for streets that are typically less formal and may not follow the main street naming conventions.

"Place" tends to indicate a smaller or quieter thoroughfare that serves a specific area, often providing access to residential neighborhoods. This helps with navigation and organization within a city's layout.

On the other hand, "Way," "Drive," and "Avenue" have different specific uses in naming streets. For instance, "Avenue" typically refers to broader, more significant avenues that can run north to south, while "Drive" usually suggests a more winding or curved road that might not fit the straight grid pattern. "Way" can also indicate a smaller, less formal street but does not specifically denote the east-west orientation that "Place" does. Thus, "Place" is the most appropriate suffix for streets aligning with the criteria mentioned in the question.