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Alleys can be just as important as primary streets to a healthy community. Concrete is typically specified for alley construction in cities throughout Colorado because of its longer service life and lower maintenance requirements. One important factor in the design of alleys is the small amount of space available for construction, which lends well to concrete. Also, alleys are often designed with an inverted crown so stormwater drains away from property. Concrete is the only material that can satisfactorily perform under these conditions.