Re: 一路 used as while

一路 mean : "along the way"
Example : 一路小心 = be careful along the way

一路(X)一路(Y) = (X)and (Y) along the way
Example: 一路行，一路講："walk and talk along the way."

一面(X)一面(Y) = (X) while (Y)
一邊(X)一邊(Y) = (X) while (Y)
Example:
一面行一面講 = "walk while talking."
一邊做一邊諗= "work while thinking."

一向 mean： "always this way "
Example: 一向冇加班費：" it is always this way- no over-time pay ."

一直 mean: "always / continually" 
Example:
 一直冇加班費: " always / continually without over-time pay ."
一直做: " do it continually."

一直(X)一直(Y) = continually (X) and continually (Y)
Example : 一直做一直諗 = continually work, and continually think
( implying at the same time)