"on road" vs "in street" - I take issue with this distinction - you can be both in and on both a road or a street, with the difference in meaning between the prepositions being similar for both nouns.
- Agreed - removed Usage note, as the distinction is much more subtle than we were making out. Ƿidsiþ 14:38, 9 November 2009 (UTC)
Compare Sanskrit RADSH (to rule) and possible ultimate √ RĀDhĀH (to tread, subdue, rule over). It is not to be connected with the correct P.I.E. root *reg "move in a straight line" (correctly specified by the O.E.D.), whence eventually Latin REX, Proto-Celtic RIX, Old Irish RI, et cetera.
 means 'Absolutely not;  means 'Exceedingly unlikely';  means 'Very dubious';  means 'Questionable';  means 'Possible';  means 'Probable';  means 'Likely';  means 'Most Likely' or *Unattested;  means 'Attested';  means 'Obvious' - only used for close matches within the same language or dialect, at linkable periods. √ means original or earliest root.