public static function create($value, $units)
    {
        // Explode units...
        list($distUnit, $timeUnit) = static::explUnits($units);

        // Create distance and time placeholders.
        $dist = Distance::m(0);
        $time = Time::sec(0);

        // Set each distance/time unit.
        $dist->{$distUnit} = $value;
        $time->{$timeUnit} = 1;

        // Create the velocity and set the format.
        $velocity         = new Velocity($dist, $time);
        $velocity->format = static::FORMAT_DEFAULT . $units;

        return $velocity;
    }