 Except where prefixed with a letter , postmiles were measured on the road as it was when the route was established , based on the alignment that existed at the time , and do not necessarily reflect current mileage . R reflects a realignment in the route since then , M indicates a second realignment , L refers an overlap due to a correction or change , and T indicates postmiles classified as temporary ( for a full list of prefixes , see the list of postmile definitions ) . Segments that remain unconstructed or have been relinquished to local control may be omitted . The entire route is in Riverside County . 
 Except where prefixed with a letter , postmiles <a href='uninflect' title='1'><mark>were</mark></a> measured on the road as it was when the route was established , based on the alignment <a href='null_relcl' title='2'><mark>that</mark></a>existed at the time , and do not necessarily reflect current mileage . R <a href='uninflect' title='3'><mark>reflects</mark></a> a realignment in the route since then , M <a href='uninflect' title='4'><mark>indicates</mark></a> a second realignment , L <a href='uninflect' title='5'><mark>refers</mark></a> an overlap due to a correction or change , and T <a href='uninflect' title='6'><mark>indicates</mark></a> postmiles classified as temporary ( for a full list of prefixes , see the list of postmile definitions ) . Segments <a href='null_relcl' title='7'><mark>that</mark></a>remain unconstructed or <a href='been_done' title='8'><mark>have</mark></a> been relinquished to local control may be omitted . The entire route is in Riverside County . 
Except where prefixed w/ a letter , postmiles was measured on the road as it was when the route was established , based on the alignment existed at the time , and do not necessarily reflect current mileage . R reflect a realignment in da route since then , M indicate a second realignment , L refer an overlap due to a correction or change , and T indicate postmiles classified as temporary ( for a full list of prefixes , see the list of postmile definitions ) . Segments remain unconstructed or done been relinquished to local control may be omitted . The entire route is in Riverside County .