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Swell "feels" bottom (half the wavelength), circular water particles change to flattened eclipses. Wavelength slows down, but period remains the same, wave becomes too high for its wavelength. Crest moves ahead of the base b/c of a 3:4 ratio of wave height to water depth and breaks.
maintain a safe cushion of space ahead and behind your vehicle
Because a truck is heavier than your car, it takes longer to stop than you do. If you drive closely ahead of a truck you are asking for trouble. If you have to stop suddenly, there is no way they are going to be able to stop as quickly as you, even if they see you stop. A truck may also roll right over you instead of just rear-ending you, and flatten your car like a pancake. Moral of the story - keep a safe distance from trucks!
sliding friction
Energetic, vital, go-ahead, lively, animated, high-powered, forceful
the sea raven is behind
ahead
The opposite of ahead is behind.
Ahead
Ahead
Ahead
ahead
ahead
behind
Behind
Behind
ahead