Following distance — ideal3–4 seconds
Following — buses / vans4–5 seconds
Following — bad weatherEven more
Headlights requiredCan't see 1,000 ft
School bus stop distance20 feet (front and back)
No passing near intersection / RR100 feet
No passing — view obstructed100 ft of bridge / tunnel
Dim high beams — oncoming500 feet
Dim high beams — following300 feet
Wipers on?Headlights ON (MD law)
Bicycle brake (10 mph)Stop within 15 ft
Pass bicyclist3 feet minimum
Bus / school bus / hazmat at RRAlways stop before crossing
Move Over LawMove over OR slow safely
💡 Maryland-unique rule: headlights are required whenever you are using your windshield wipers in inclement weather — not only at night or in fog.