These highways are designated as snow emergency routes in Frederick County. Parking is prohibited on these routes:
- U.S. Route 15
- U.S. Route 15 (Business)
- U.S. Route 40
- U.S. Route 40 (Alternate)
- U.S. Route 340
- MD Route 17
- MD Route 26
- MD Route 27
- MD Route 28
- MD Route 31
- MD Route 75
- MD Route 76
- MD Route 79
- MD Route 80
- MD Route 85
- MD Route 140
- MD Route 144FA
- MD Route 180
- MD Route 194
- Interstate 70
- Interstate 270