Rigid pavements are not expected to have cracks wider than hairline. Crack sealing hairline cracks in a rigid pavement has not been shown to be cost effective (see Fig. 3.55), and will result in a noisier and rougher riding pavement. Where cracks are found to be wider than 1/8 in (3 mm) and less than 1/4 in (6 mm), crack sealing may be beneficial; however, further investigation is recommended, as more serious problems may be present.