PURPOSE OF THE GUIDELINES These design guidelines include provisions for considering the effects of temperature on reinforced and prestressed concrete bridge superstructures. Temperature effects result from time-dependent fluctuations in the effective bridge temperature or from temperature differentials within the bridge superstructure. All concrete bridges should be designed for temperature effects resulting from time-dependent fluctuations in the effective bridge temperature. For serviceability considerations@ prestressed concrete bridges should also be designed for the effects of temperature differentials within the bridge superstructure.