What is the longest slab that can be laid for a bridge having an underpass with a multiple lane road?

It depends on the construction process is used, in turn this is determined by the vain to fight without intervening in traffic. What would the span length?. With that space is counted in the vicinity of the work zone? Could you implement a central pillar of support, within the median separation between driveways and execution would be feasible, perhaps reducing one lane of each carriageway?. With few account each roadway lanes, that is, what is the type section of the highway to cross?. Greetings.