Many urban highway construction projects have severe traffic control and congestion issues. To expedite construction and minimize travel delays for the public, contract restrictions on dates and times that travel lanes can and can not be closed to travel are imposed. Project contracts may also impose large bonuses and disincentives for time of completion. Pavement using Class P concrete may be opened in as little as two days to contractors' vehicles and as little as three days to all traffic, if opening strength is achieved. After curing is complete and when earlier age job control testing is permitted or required, and the tested strength is greater than the required opening strength, the pavement may be opened to traffic.

Class HES (high early strength) concrete may be used in small areas and leave-outs. Class HES has additional strength requirements beyond Class P concrete to ensure that the high early strengths for opening to traffic are realized.