A driving support apparatus includes: a driving support controller for starting to execute a driving support control when a support start condition is met; a current position detector; and a driving direction determination unit for successively determining whether there is a possibility of a vehicle turning at an intersection in a direction, to which a blinker turns. From the relation between the syndromes and the coefficients of the error locator polynomial, the inference that the first t syndromes are zeros, then the next t syndromes are also zeros can be deduced, wherein t is the largest number of correctable errors. The tube diameter and tube spacing may be varied through the tube passes through the heat exchanger in order to provide a hot side conductance to cold side conductance ratio which results in the tube temperature being safely above the liquid freezing point. The shoe support includes an attachment member adjustably coupled to the stationary boat mounting structure, and a footrest member attached to the attachment member.