The AASHTO Type VI modified beam shape was the workhorse for long span prestressed concrete bridges until advancements in concrete material properties lead to the more economic Bulb-T beam shape.  This AASHTO beam section is still specified on some bridge projects and NPP has committed to maintaining the tooling required to continue to fabricate these beams.  Currently the maximum beam length of the AASHTO Type VI (modified) is 165 feet using conventional design.