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Exit numbers on the beltway have gone through several iterations. Originally, all exits on the beltway were numbered sequentially in a clockwise direction, starting with exit 1 for US 1 in Alexandria, and the last exit number being 38 for I-295 in Prince George's County.
As opposed to I-495 (Capital Beltway) around Washington, D.C., on which exit numbers are generally arranged by mileposts counterclockwise starting at the southern crossing of the Potomac River, the exit numbers for the Baltimore Beltway are arranged consecutively clockwise starting at interchange 1 at Quarantine Road, west of the Francis Scott ...
Exit 40 along the Capital Beltway (I-495) circling Washington, D.C., which is located at milepost 40 An exit sign (kilometer-based) on Quebec Autoroute 640 in Quebec. As more highways were built, states and countries began to experiment with distance-based (mile-based or kilometer-based) exit numbers.
The beltway was designated as part of the state highway system, reusing the Loop 8 number, on May 7, 1969. Because the proposed route had been referred to locally as the Outer Belt, and Harris County used similar nomenclature for segments of the route, the designation was changed to Beltway 8 on July 31, 1969. [ 7 ]
Interstate 495 (I-495) is an auxiliary route of I-95 in the US state of Massachusetts, maintained by the Massachusetts Department of Transportation (MassDOT). Spanning 121.56 miles (195.63 km), it is the second-longest auxiliary route in the Interstate Highway System, being roughly 11 miles (18 km) shorter than I-476 in Pennsylvania.
Interstate 595 (I-595) is an unsigned number for a section of the John Hanson Highway (US 50 and US 301) from I-95/I-495 (Capital Beltway) east of Washington, D.C., east to MD 70 (Rowe Boulevard) at Annapolis, Maryland.
At exit 42, westbound US 36 and southbound SR 67 reenter the beltway. I-70 once again meets I-465 at exit 44. At exit 46, US 40 west reenters the beltway, while US 52 leaves at exit 47. US 421 leaves at exit 49, and I-74 west enters the loop at the same exit. Along with this, I-465 completes its final directional change westbound.
The state of Illinois uses exit numbers on three freeways, on Illinois Route 6 (IL 6) between in Peoria, IL 390 in the northwestern suburbs of Chicago, and IL 255 in the suburbs of St. Louis. The state of Indiana uses exit numbers on two highways with freeway segments, on US 31 between Indianapolis and South Bend and SR 912 in northwest Indiana.