Assuming you're not the one driving on this road trip? If you get an opiate or something and start nodding in the middle of the road you'll kill someone. Honestly I don't see the point in taking it at all, it won't make a road trip any more tolerable. Ten hours is shit but at best you'll get a bit of sleep on the road, also Xanax lasts about 6 hours, maybe even less, so you're gonna feel like shit for the second half of the road trip. You like psychedelics, right? Save it for a bad trip. Or drop some acid on the road, take the Xanax just in case. It sounds pointless to me to take it by itself unless you could get some opiate or other, any really, just that alprazolam is great for helping you talk to people and sitting in front of the TV doing nothing and not much good for anything else. Also, tripping while in a moving vehicle sounds awesome to me because you could see so much and see how acid affects different scenes, especially if you take the back roads. I mean like, I just got back from some countryside village and the drive back had some great views, and it'd look rad on acid. But maybe you don't live in northern England, maybe you live in NYC and you're going to LA, there's tons of shit to see there, from deserts to forests. Why wouldn't it be your first choice?
Anyway, although pill identification isn't allowed here and that part of your post and this part of mine will probably be edited out, yes that is Xanax. See? --->
https://www.drugs.com/imprints/g-372-2-7284.html
People can press their own pills of course but what's the fucking point? You'd be using like .5mg less alprazolam and a spending a fiver on whatever you cut it with, say it was oxycodone or something you'd be getting rid of about $2 worth of Xanax and replacing it with a much more expensive drug, plus pressing your own pills is a chore in itself.