An enhanced vehicle barrier system. , a glass transition temperature below 120 C. In current-in-plane embodiments, the side shield assembly includes a pair of side shields of magnetically shielding material adjacent a lower portion of the read sensor formed on a lower read gap. The first sustaining-clamp circuit includes a first current cut-off device which prevents a current from running to the second power-source terminal from the first ground terminal, positioned in a current path other than a current path through which a current runs when a voltage is applied to the scanning electrode through the first power-source terminal. In accordance with the invention the measured quantity of lubrication oil is directly supplied from the running surface of the cylinder andor is directly supplied from the combustion space andor is directly supplied from a piston ring package of the piston to the oil collection device. Thus, the propelling system has the advantage of increasing the utilization of the internal space of the boat.