halacha - How to say Tefilas HaDerech while on the road alone

My question applies to circumstances in which one is driving an extended distance by oneself. They also apply primarily--though not exclusively--to people who do not have the Tefilos HaDerech memorized, or whose minhag is to daven in front of a text at all times (i.e., Chabad).

One is supposed to say Tefilos haDerech while on the road. (Source: http://www.chaburas.org/derech.html). Presumably, attempting to say the prayer while actually driving would be prohibited for reasons of pikuach nefesh and kavana. The other options are to pull over, and say the prayer while stopped on the shoulder (i.e., of the highway), or to leave the highway and say the prayer at a rest stop or somewhere off an exit. However, both these options would seem to have problems. The first (stopping on the shoulder) seems like it could still be quite dangerous, especially for visibility reasons at night, or in bad weather conditions. The second is not always practical, and I am not 100% sure whether it would fall under the halacha of literally being on the road.

So, how, when, and where should one say this prayer?

Answer

If you have a mechanism (such as Bluetooth) for safely talking on a cellphone in your car:

There's a service I once heard of (in the United States) that is provided for precisely this purpose. In short, call 212-DRIVING (+1-212-374-8464) and a man will dictate the Tefillah. He even pauses after each phrase to let you repeat it as he's saying it.

Similarly, you can call a friend and ask him to dictate the Tefillah to you.

Otherwise:

Take the next exit / rest area, pull over, and then say it.

The second is not always practical, and I am not 100% sure whether it would fall under the halacha of literally being on the road.

I'm not sure where you get the halacha that you literally need to be on the road. The tefillah is for travelling. It needs to be said after a certain minimum distance has been traveled outside the city limits, but does not need to be said while actually traveling. As long as you have a certain minimum distance left for the travel, you can still say it.

As for the practicality of it: barring emergencies, I really cannot imagine a highway or road system that does not have stopping areas along the way...