īr
The modifier īr refers to the back of something. This is the same root as sīra. So, rā NP īr is to the back of NP or to behind NP and rū NP īr is from the back of NP or from behind NP.
rājīr
rājīr is rā NP īr without a specified location, and so means ‘to the back’.
rūjīr
Likewise rūjīr is rū NP īr without a specified location, and so means ‘from the back’ or ‘from behind’.
hāl
The modifier hāl refers to the front of something. This is the same root as sahāla. So, rā NP hāl is to the front of NP and rū NP hāl is from the front of NP.
rājahāl
rājahāl is rā NP hāl without a specified location, and so means ‘to the front’.
rūjahāl
Likewise rūjahāl is rū NP hāl without a specified location, and so means ‘from the front’.
pēxa
pēxa only occurs with the locative preposition rū. rū NP pēxa means away from a location, with a connotation that away from is far away from. So, rū jahāwekien means ‘from the shore’ and rū jahāwekien pēxa means ‘[far] away from the shore’.
rūjapēxa
rūjapēxa is rū NP pēxa without a specified location, and so just means ‘away’.
ñi liēn rūjapēxa;
I went away.
nō
nō only occurs with the preposition rā. rā NP nō means towards a location along a path. So rā jatōna is ‘to the road’ and rā jatōna nō is ‘along the road’.
rājanō
rājanō is rā NP nō without a specified location.
ñi liēn rājanō;
I went along [a path].
rū
This particle along with the relational NI denotes motion away from something. So:
ñi liēn rū jahāwekien;
I went [away] from the shore.
Edit: changed rā to rū in the example sentence.
rā
This particle along with the relational NI denotes motion towards something. So:
ñi liēn rā jatōna;
I went to the road.