Altimeter Knot Visual Flight Rules 
Pilot Institute
APRIL 24, 2024
They try to make the underlying airspace easily navigable by visual flight rules (VFR) aircraft. This effectively limits traffic in Class B to 250 knots due to 14 CFR § 91.117(a). Traffic flying under a shelf or through a VFR corridor needs to stay below 200 knots. Expect considerable traffic near Class B airspace.
AeroSavvy
JANUARY 16, 2024
Early generation maps displayed four colors that correlate to the four basic flight categories. Green – VFR ( Visual Flight Rules ) Ceiling > 3,000 ft. Winds over 15 knots are indicated by flashing yellow lights. C ( 12°F)/-11.0°C Only two elements of the METAR were used: cloud height and visibility.
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