Massachusetts → District of Columbia · Interstate 90 (Massachusetts Turnpike)
On heavy-rain or dense-fog days the Boston, Massachusetts, to Washington, District of Columbia, leg routinely demands well more than the 9h 15m estimated: Interstate 90 (Massachusetts Turnpike) carries known hydroplaning hot spots and reduced-visibility corridors that justify dropping to 35 mph through a few short stretches. The outbound run covers 705 km (438 miles) over varied topography between Boston (the New England capital and one of the oldest US cities) and Washington (the capital of the United States and seat of the federal government), demanding sharper attention on mountain descents and shoulder-less curves. Before pulling out, check brake-pad wear, tire tread depth, and washer-fluid level in the reservoir. Fuel spend holds near $58.97 for the 64.1 liters (16.9 gallons) consumed. Even in adverse conditions, the flat tariff of $0.43/km guarantees the standard outbound payout of $303.15 — log any incidental costs (extra toll, mandatory meal, emergency lodging) in a separate field on the Clara receipt.