Horizon Zero Dawn is a huge game and getting around the large open-world environment can get tedious if Aloy is running all the time. Here are two things you can do to try and speed up the process.
First there is Fast Travel, although you need to buy/craft a pack in order to do this. A Fast Travel Pack can be crafted for 15 Ridge-Wood, 1 Fatty Meat and 1 Bony Meat. You can also buy Fast Travel Packs from Merchants.
Ridge-Wood can be found on small trees all over the place. You can get the two types of meat by hunting real-life animals such as rabbits, foxes or boars. Bear in mind you can only fast travel to save points you have been before. Save points can be seen on the map as fires. Look out for any fire places you see.
Another thing you can do is ride on certain machines as use them as a mount. At a certain point of the game, you can override one of the machines and ride on them. You need to have completed Cauldrons to override even more machines in the game. Cauldrons can be found on your map as blue triangles. They are like dungeons you have to complete. Only horse-like machines can be ridden though.
Anyway, we hope this Horizon Zero Dawn guide will be useful to you. Travelling just by walking can be time consuming if you are running all of the time. These two things help speed up the process.