An automated storage and retrieval system including at least one autonomous transport vehicle, a transfer deck that defines an undeterministic transport surface for the at least one autonomous transport vehicle, the transfer deck having multiple travel lanes, at least one reciprocating lift, and at least one pickface handoff station connected to the transfer deck and interfacing between the at least one autonomous transport vehicle on the transfer deck and the at least one reciprocating lift so that a pickface is transferred between the at least one reciprocating and the at least one autonomous transport vehicle.