We have in PIE:
e̯eitr way, pedestrian road
e̯iteros other, another, next
I wonder whether the word for "one"
e̯oinos alone, separated
connected to the above?
Note that the PIE word e̯oinos had clear meaning of "one alone", "one separated" contrasted with another word for "one", som which meant "united", "one together".
There was also word for "thus", "ergo", "it follows that" which confusingly Mallory gives as e̯ita̯ while Beekes gives as e̯ei and analyses as locative case of pronoun e̯e "that".