Deflection and vibration play an important role on the serviceability of bridges.Hence most design codes specify deflection and/or vibration limits.Some codes specify deflection or span-depth ratio limit and others specify vibration limit using natural frequency or acceleration.The current AASHTO specifications specify span-to-depth ratio and static deflection at L/800 for ordinary traffic and L/1000 for pedestrian use where L is the span length have been employed for many years since 1871 and no major change have been made for highway bridges since 1936.American Society of Civil Engineers (ASCE) committee in 1958reviewed historical of deflection limit and investigated the effect of deflection to structural damage,they conducted that no relationship between excessive live-load deflection and structural damage and the limiting of deflection seems to be a method controlling vibration.Bridge vibration concerns are based upon human perception,human perception of vibration depends on velocity of vehicles,deflection,acceleration,frequency.In order to control human perception,many criteria on deflection,acceleration,velocity,frequency have been issued.