kevlar u00ae by the dupont company this armoring helps to assure that communication between controller 66 and reservoirs 18 remains in effect during an impact event post impact communications are further aided by redundancy in the control system specifically four independent sets of primary conductors 79 a d extend from controller 66 to reservoirs 18 protected by sheath 82 moreover an h conductor shown at 81 in fig5 extends between reservoirs 18 thus if one or both of the primary conductors 79 a b or 79 c d extending to one of reservoirs 18 should become severed h conductor 81 will be available to carry the initiation signal from the undamaged lines to both of reservoirs 18 as noted above an important feature of the present invention resides in the fact that the control parameters include not only vehicle impact as measured by an accelerometer such as that shown at 70 in fig9 but also vehicle speed as measured by means of speed sensors 74 also shown in fig9 speed sensors 74 may advantageously be existing sensors used with an anti lock braking system or vehicle stability system alternatively speed sensors 74 could comprise a global positioning sensor or a radar or optically based ground sensing system accelerometer 70 as noted above could be used with a conventional occupant restraint airbag system thereby maximizing use of existing systems within the vehicle advantageously.