A brake application speed is compared with a speed threshold value so as to judge whether or not a braking operation being performed is an emergency braking operation. The narrow waveguide expands the lateral mode size, creates a large modal spot size, and insures higher-order modes are beyond cutoff. Above the fuel receiving portion is formed a slit-shaped opening portion which opens toward the fuel filter. The microlens is configured to direct incident light to the light sensing region, and the reflective structure is configured to reflect portions of the incident light that pass through the light sensing region back toward the light sensing region. The information is normalized by scaling the meaningful data by industry type. For fastening, the said flipper fastening strap goes vertically into the fastener to improve the fastening method of bending the traditional fastening strap reversely at 180, to eliminate the situation of bending and cracking generated after a certain period of application and to increase the useful life of the present invention.