Transport Research International Documentation (TRID) https://trid.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ OPERATING SPEEDS AND SPEED ZONING https://trid.trb.org/View/118095 Wed, 28 Jun 1972 00:00:00 GMT https://trid.trb.org/View/118095 CENTER STRIPPING AND LANE MARKINGS IN OHIO https://trid.trb.org/View/116978 Sun, 18 Jun 1972 00:00:00 GMT https://trid.trb.org/View/116978 RURAL HIGHWAY GRADE INTERSECTION LAY-OUTS AND SPECIAL SIGNS; ADVANTAGES OF T AND Y TYPE INTERSECTION; CLEAR VIEW AREA REQUIRED, WITH DISCUSSION https://trid.trb.org/View/116979 Sun, 18 Jun 1972 00:00:00 GMT https://trid.trb.org/View/116979 WARNING SIGNS AND DEVICES FOR ORDINARY HAZARDS, SAFE SPEED SIGNS, ETC. https://trid.trb.org/View/116980 Sun, 18 Jun 1972 00:00:00 GMT https://trid.trb.org/View/116980 SPECIAL HAZARD WARNING SIGNS https://trid.trb.org/View/116981 Sun, 18 Jun 1972 00:00:00 GMT https://trid.trb.org/View/116981 SHOULDER WIDTHS AND TREATMENTS ON TWO-LANE PAVEMENTS https://trid.trb.org/View/116982 Sun, 18 Jun 1972 00:00:00 GMT https://trid.trb.org/View/116982