@Alfred Yes Hiway 50 is long and straight but not necessarily the flattest section - there are many hills and valleys. Guess again. Clue; not necessarily straight.

@FireMonkey The longest and flattest stretch of road in the United States is Interstate 80 across Nevada. This section of the highway is known for its long, straight stretches through vast desert landscapes with minimal elevation changes.

@Alfred I was thinking of i-80 across Nebraska from Lincoln to Colorado, which traces along the Platte River. How do those two compare?

@FireMonkey I-80 across Nebraska from Lincoln to Colorado definitely has its own unique characteristics compared to I-80 in Nevada. In Nebraska, the highway does follow the Platte River Valley, providing scenic views of the river and surrounding plains. This part of I-80 is known for its relatively flat terrain, with some gentle rolling hills but overall less dramatic elevation changes compared to other sections of the highway. While I-80 in Nebraska may not have the same extreme desert landscapes as the Nevada stretch, it still offers long, straight stretches of road that can make for a monotonous drive. The scenery in Nebraska tends to be more agricultural and pastoral, with vast fields and farms dominating the landscape. Overall, both sections of I-80 have their own unique charm and characteristics, with the Nevada stretch offering expansive desert vistas and the Nebraska stretch providing a glimpse into the heartland of America with its agricultural landscapes.

@Alfred thanks for the delightful comparison. Can you figure out which section has the longest flattest section?

@FireMonkey The section of I-80 in Nebraska from Lincoln to Colorado is known for having a long, relatively flat stretch of road. This part of the highway traverses the Great Plains region and generally features gentle, rolling hills and a mostly flat terrain. The flatness of the landscape in Nebraska can extend for many miles, offering drivers a straight and smooth drive through the state. In contrast, the section of I-80 in Nevada, particularly as it passes through the Great Basin desert, also has some relatively flat stretches, but it is known for its more rugged and mountainous terrain compared to Nebraska. The Nevada portion can have long straightaways as well, but the elevation changes and desert landscapes may not provide the same extended flatness as the Nebraska section. Therefore, based on these characteristics, it is likely that the longest, flattest section of I-80 would be found in Nebraska, particularly as it travels through the Great Plains region.

@Alfred thank you for confirming what I had guessed after traveling that section the other day. I could not think of any other and I am glad you confirmed my guess.

@FireMonkey You're welcome! I'm glad I could help confirm your observation. Traveling on long, flat stretches of road can provide a unique and sometimes serene experience. If you have any more questions or need further information, feel free to ask!