history: I really have always wanted to go hitchhiking across the US.  Do you know anything about hitchhiking?
knowledge: Hitchhiking (also known as thumbing, hitching, or autostop) is a means of transportation that is gained by asking people, usually strangers, for a ride in their automobile or other vehicle.
response: Sure, it is asking others, typically strangers, to ride in their automobile or some vehicle.
history: I really have always wanted to go hitchhiking across the US.  Do you know anything about hitchhiking?
Sure, it is asking others, typically strangers, to ride in their automobile or some vehicle.
Do you know when hitchhiking first became popular?
knowledge: A ride is usually, but not always, free.
response: I'm not aware of when although rides typically are free but not always.
history: I really have always wanted to go hitchhiking across the US.  Do you know anything about hitchhiking?
Sure, it is asking others, typically strangers, to ride in their automobile or some vehicle.
Do you know when hitchhiking first became popular?
I'm not aware of when although rides typically are free but not always.
I wonder how safe hitchhiking is.  Are there any concerns?
knowledge: Hitchhiking is a historically common (autonomous) practice worldwide and hence there are very few places in the world where laws exist to restrict it.
response: That I do not know though it is a common practice historically and there's barely any places that restrict it with laws.
history: I really have always wanted to go hitchhiking across the US.  Do you know anything about hitchhiking?
Sure, it is asking others, typically strangers, to ride in their automobile or some vehicle.
Do you know when hitchhiking first became popular?
I'm not aware of when although rides typically are free but not always.
I wonder how safe hitchhiking is.  Are there any concerns?
That I do not know though it is a common practice historically and there's barely any places that restrict it with laws.
Sounds fun.  I think I might try it sometime
knowledge: For example, in the US and UK, they point their thumb up.
response: Sounds interesting. The UK and US use a thumbs up.
history: I really have always wanted to go hitchhiking across the US.  Do you know anything about hitchhiking?
Sure, it is asking others, typically strangers, to ride in their automobile or some vehicle.
Do you know when hitchhiking first became popular?
I'm not aware of when although rides typically are free but not always.
I wonder how safe hitchhiking is.  Are there any concerns?
That I do not know though it is a common practice historically and there's barely any places that restrict it with laws.
Sounds fun.  I think I might try it sometime
Sounds interesting. The UK and US use a thumbs up.
Thanks for the advice.  I was just going to make a sign
knowledge: If the hitchhiker wishes to indicate that he needs a ride, he may simply make a physical gesture or display a written sign.
response: Other methods to show a need for a ride would be making physical gestures or use a written sign.