Final answer:
The highway in North America that crosses the most lines of longitude is likely Interstate 90 (I-90), extending from Seattle, Washington, to Boston, Massachusetts.
Step-by-step explanation:
In North America, the highway that crosses the most lines of longitude is likely a transcontinental route that spans from the west to the east coast. Considering the range of latitudes and longitudes provided, a key highway to consider would be Interstate 90 (I-90), which travels from Seattle, Washington, to Boston, Massachusetts, covering a broad span of longitudes from around 122W in Seattle to 71W in Boston.
The line of the highest points in North America that marks the separation between rivers flowing eastward and westward, which might influence highway construction, is the Continental Divide. However, the specific highway crossing the most longitude lines would not necessarily follow this divide, as highways are built for transportation efficiency rather than following geographical features strictly.
Looking at the latitudes and longitudes given for Western North America, from regions such as British Columbia to California, these span a wide range of longitude lines but are more in a north-south direction, which further reinforces the likelihood of an east-west route like I-90 holding the record for crossing the most lines of longitude.