Gaps - Breaks in the traffic stream long enough to permit vehicles or pedestrians access across or into the traffic stream. Gore - The V-shaped area that separates through-traffic from exiting or entering traffic on freeways and highways. Grade Separation - A crossing that uses an underpass or overpass to eliminate conflict points.
Although blood pressure varies from person to person, a blood pressure reading of 90 millimeters of mercury (mm Hg) or less systolic blood pressure (the top number in a blood pressure reading) or 60 mm Hg or less diastolic blood pressure (the bottom number) is generally considered low blood pressure.
Your blood pressure consists of two numbers: The top or higher number is called the systolic number (pressure in vessels when your heart is beating), and the bottom or lower number is your diastolic number (pressure in your vessels when your heart is at rest). Here are the numbers you need to know: Optimal blood pressure: 115/75