I've done a lot of road trips throughout the United States and Canada. Those trips took me to all 50 U.S. states (last one was Hawaii in 1999) and their capital cities, the District of Columbia, and Puerto Rico. I've also visited all the Canadian provinces and territories, including stops at their respective capital cities.

Within the United States, I've been to all 3142 of its counties or county equivalents (like parishes, independent cities, and Alaska census areas). I finished off my last U.S. counties during my trip to the Extra Miler Club annual meeting in Arlington, Texas on July 10, 2010. The site where I track my visited counties has a map illustrating how I got to 3142. By then, I had also been to a lot of the counties and equivalents in Canada, and in multiple return visits to Canada I set out to finish off the rest. On July 15, 2016, I completed that project, in Alberta's Improvement District No. 4 (Waterton Lakes National Park). Another map shows how I got there. That site has a third map showing how little of Mexico I've traveled (only a handful of border areas, in three estados)

I've traveled almost every mile of every Interstate open as of January 2018 (I'm missing a few miles of several new segments, and more new ones keep popping up here and there), including the little-known unsigned Interstates in Alaska and Puerto Rico, as well as many of the business (mostly non-freeway) Interstates. I've also been on over 70% of the U.S. route network (including business and other auxiliary routes), and all of the Trans-Canada Highway system. A new site has tables and maps showing most of my travels up to January 2018 on the Interstate and U.S. route systems, and also some of my travels on other highways in the U.S. and Canada, as well as a few in Mexico and Europe.

I've driven the three highest auto roads in the United States (the Mt. Evans toll road in Colorado, climbing to 14,150 feet at a parking lot just below the summit; the Pikes Peak toll road in Colorado, to its summit at 14,110 feet; and John A. Burns Way almost to the summit of Mauna Kea on Hawaii's Big Island, topping out at about 13,780 feet), as well as the highest through road (Trail Ridge Road in Rocky Mountain National Park in Colorado, peaking at 12,183 feet), and the highest Interstate (west portal of the Eisenhower Tunnels on Interstate 70 in Colorado, at 11,158 feet). I've also driven the lowest road in the United States, Badwater Road in Death Valley National Park in California, dropping under -270 feet.

Note: Click any photo below to view a larger version.

High road, low road:  On the left, the parking lot atop Mt. Evans, Colorado, the highest road in North America, photographed from the summit (my car is the sliver one in the center, closest to the bottom of the photo and pointing toward the bottom); on the right, me at the lowest point in North America in Death Valley, California, about a hundred yards from Badwater Road. Both photos were taken on the same cross-country road trip, in summer 1996.

• westernmost point on the continuous North American highway network (counting the Alaska Marine Highway auto ferry link out to the Aleutians from Homer), and westernmost point I've ever visited, at the Port Lekanoff entrance at the western end of Captains Bay Road in Unalaska, Alaska
• westernmost highway on the North American mainland, the Bob Blodgett Nome-Teller Highway in northwestern Alaska
• easternmost point and road in the United States, to West Quoddy Head, Maine
• easternmost point and road in North America, to Cape Spear, Newfoundland
• easternmost road driven anywhere, on the M25 motorway east of London, England
• easternmost place anywhere I've been to as an adult, visiting an aunt in Milan, Italy (as a baby, I was taken to Naples, Italy, to be shown off to my grandparents there)
• northernmost place in the United States, and northernmost place I've ever been to, Utqiaqvik (Barrow), Alaska (by plane -- town is not accessible by road)
• northernmost highway in the United States and in North America, the Dalton Highway (Alaska state route 11) to the Arctic Ocean at Deadhorse
• northernmost highway in Canada, the Dempster Highway (Yukon route 5/Northwest Territories route 8) to Inuvik, NT
• southernmost point and road in the United States (excluding Puerto Rico, and the other commonwealths and territories), Ka Lae, at the south end of South Point Road on Hawaii's Big Island
• southernmost place I've ever visited, on the Caribbean island of Guadeloupe (perhaps the Club Med Caravelle resort near Ste. Anne, where I spent most of my visit)
• southernmost point and road in the contiguous United States, in Key West, Florida near the south end of U.S. 1

The End Of The Line (north): Me, wading into the Arctic Ocean, at the end of a van tour up Alaska's Dalton Highway, northernmost highway in North America. (My flight back to Fairbanks stopped at Barrow, northernmost place in the United States, but I didn't get off the plane or take any pictures.) (July 1994)	The End Of The Line (south): Ka Lae, at the end of South Point Road on Hawaii's Big Island, the southernmost point and road in the fifty states. (October 1999)
The End Of The Line (west): This is as far west as you can drive from the rest of the North American highway network (via a long, expensive, auto ferry route to the Aleutians that only operates half the year), at the entrance to Port Lekanoff on Captains Bay Road in Unalaska, Alaska. (July 2007)	The End Of The Line (east): This parking lot is at the end of the unnumbered highway to the Cape Spear National Historic Site in Newfoundland, easternmost point in North America (not counting Greenland). The new and old Cape Spear lighthouses, respectively, are in the background. (August 2003)

On the 1994 trip, I hit the beach and waded into the ocean on all four coasts (Atlantic, Pacific, Gulf, and Arctic). The 1996 trip included the highest and lowest roads in North America (respectively, to Mt. Evans in Colorado and the bottom of Death Valley in California). The 1994 and 1996 trips each lasted about two months (including stops such as to visit family), with over 17,000 miles driven. My second 2012 cross-country drive, all the way to Alaska with side trips to Canada's Northwest Territories, took about two and a half months, and covered over 24,000 miles (all in my gas-hog pickup truck, and many of them in high-gas-price Canada, so that trip really put a dent in my checking account). Putting a deeper dent in my checking account was an August 2014 trip to Canada's Nunavut Territory in the Arctic, which has no road connections to anywhere else so I had to fly up there. Three breakdowns on my longest road trip, in 2017, about two and a half months and around 25,000 miles, made that the last road trip for my pickup truck, which I got rid of after I got back home.

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