Video files recorded on a disk recording medium are acquired from an image capturing apparatus. The transverse cross-section of the elongate translucent diffuser may have various shapes, all having substantially flat tops, including but not limited to quadrangular, rectangular, trapezoidal, and non-isosceles variations of these shapes. 2 minute of the stress release, and is not more than 34. The excessive speed monitoring portion makes the braking apparatus perform a braking operation when car speed reaches the excessive speed detection level. The completed core is then surrounded by a conventional paddle board skin.