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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
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    <language>en-us</language>
    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
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    <item>
      <title>STABILIZATION OF SOILS AND SURFACES BY USE OF VARIOUS STABILIZING AGENTS ON IOWA SECONDARY ROADS</title>
      <link>https://trid.trb.org/View/121724</link>
      <description><![CDATA[THE SUCCESS IS NOTED OF THE 1948 PROGRAMME WHICH PROVIDED FOR A SURFACED ROAD TO BE BUILT TO EVERY FARM IN IOWA. IT HAS BEEN UP TO 97 PER CENT SUCCESSFUL. USE WAS MADE OF BITUMINOUS MATERIALS, CALCIUM AND SODIUM CHLORIDE, CEMENT, HYDRATED LIME AND OTHER CHEMICAL ADDITIVES AS STABILIZERS. /RRL/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:40:33 GMT</pubDate>
      <guid>https://trid.trb.org/View/121724</guid>
    </item>
    <item>
      <title>PARTICLE-SIZE LIMITS IN HIGHWAY SOIL ENGINEERING</title>
      <link>https://trid.trb.org/View/121133</link>
      <description><![CDATA[SOIL TEST METHODS IN WHICH PARTICLE SIZE IS DETERMINED, AND SOIL CLASSIFICATION ARE DISCUSSED. THE HISTORY OF TEST METHODS, CLASSIFICATION, AND SPECIFICATIONS ARE REVIEWED. HIGHWAY ENGINEERS ARE OPPOSED TO CHANGES IN PARTICLE-SIZE LIMITS AND SPECIFIC SIEVE DESIGNATIONS THAT HAVE BEEN IN USE FOR SEVERAL DECADES. THE NO. 200 SIEVE (0.074 MM) HAS BEEN IN USE FOR A HALF-CENTURY TO SEPARATE COARSE-GRAINED FROM FINE-GRAINED MATERIAL, AND IS USED TO PROVIDE ONE OF THE THREE PRINCIPAL ITEMS REQUIRED FOR CLASSIFICATION OF SOIL MATERIALS IN ACCORDANCE WITH THE AASHO METHOD THAT HAS BEEN USED FOR 20 YEARS. THE NO. 10 SIEVE (2.0 MM) HAS BEEN CONSIDERED AS THE UPPER SIZE LIMIT OF SAND SINCE 1920. THE HIGHWAY ENGINEERS ENGAGED IN SOIL SURVEY TEST INFORMATION WITH U.S.D.A. ARE STRONGLY IN FAVOR OF RETENTION OF 2.0 MM AS THE UPPER LIMIT OF SAND, IN CONTRAST TO SOME OTHER ENGINEERING DISCIPLINES THAT FAVOR 4.76 MM (NO. 4 SIEVE). ALTHOUGH AASHO STANDARDS GIVE 0.005 MM AS THE SEPARATION POINT BETWEEN SILT AND CLAY, MANY HIGHWAY ENGINEERS FAVOR 0.002 MM, HENCE ACCEPTANCE AND EVENTUAL ADOPTION OF THE LATTER SIZE BY AASHO IS POSSIBLE. RESPONSE TO A QUESTIONNAIRE TO THE STATE HIGHWAY DEPARTMENTS INDICATES MAJOR OPPOSITION TO 0.0625 OR 0.06 MM AS THE LIMIT BETWEEN SAND AND SILT.]]></description>
      <pubDate>Sun, 15 Aug 2004 02:38:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/121133</guid>
    </item>
    <item>
      <title>THE BEST INVESTMENT A NATION EVER MADE. A TRIBUTE TO THE DWIGHT D. EISENHOWER SYSTEM OF INTERSTATE AND DEFENSE HIGHWAYS.</title>
      <link>https://trid.trb.org/View/468130</link>
      <description><![CDATA[This report provides an assessment of the manifold benefits of the interstate highway system.  Research by leading transportation authorities and standard statistical methods have been used to estimate the impacts of the interstate highway system.  The imperative for upgrading the interstate highway system and other super-highways is described and shown to be readily affordable within the capability of present highway user fee revenue.]]></description>
      <pubDate>Tue, 19 Nov 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/468130</guid>
    </item>
    <item>
      <title>PRESENT DAY PROBLEMS AFFECTING SOIL MATERIALS</title>
      <link>https://trid.trb.org/View/123596</link>
      <description><![CDATA[PROBLEMS BRIEFLY DISCUSSED INCLUDE'THE FAILURE OF CUT AND FILL SLOPES AND THE INADEQUACY OF THE SWEDISH CIRCLE METHOD FOR INVESTIGATING SLIDES, THE SETTLEMENT OF APPROACH FILLS WITH RESULTING BRIDGE DAMAGE, DIFFICULTIES WITH HIGH GROUND WATER TABLE AREAS, EMBANKMENT CONSTRUCTION OVER UNSTABLE AREAS, THE CORROSION OF CERTAIN CULVERT MATERIALS BY AGENTS IN THE SOIL, SOIL ERODIBILITY. /RRL/]]></description>
      <pubDate>Thu, 01 Dec 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/123596</guid>
    </item>
    <item>
      <title>MISSOURI COLLEGE SHOWS 'EM HOW</title>
      <link>https://trid.trb.org/View/107658</link>
      <description><![CDATA[THE CENTRAL MISSOURI STATE COLLEGE WILL BECOME THE SITE OF ONE OF THE MOST EXTENSIVE DRIVER EDUCATION FACILITIES IN THE UNITED STATES. THE MULTI-CAR DRIVING RANGE BEING CONSTRUCTED WILL INCLUDE SUCH INNOVATIONS AS A VAST, FULLY- EQUIPPED MULTIPLE-CAR DRIVING RANGE, A 12-PLACE DRIVING SIMULATOR, AND A RADIO-COMMUNICATIONS CONTROL SYSTEM. LAYOUT OF THE RANGE INCLUDES: (1) A 700-FOOT, FOUR-LANE, DIVIDED HIGHWAY TO PERMIT STUDENTS TO PRACTICE FREEWAY-TYPE DRIVING PROCEDURES, (2) ENTERING AND EXIT RAMPS, (3) GRAVEL ROAD, (4) STEEP HILL FOR PRACTICING PARKING ON AN INCLINE, (5) SERIES OF MANEUVERING EXERCISES, INCLUDING FIGURE EIGHT, TRAFFIC SIGNALS, MULTIPLE INTERSECTIONS, AND GARAGE PARKING, (6) SKID PAN, A 100-FOOT BY 200-FOOT AREA THAT CAN BE TREATED TO PROVIDE A SLICK SURFACE, AND (7) REST-ROOMS, OFFICE SPACE AND CLASSROOMS, PARKING LOT, AND CONTROL TOWER, WHICH WILL ENABLE ONE INSTRUCTOR TO KEEP ALL VEHICLES UNDER SURVEILLANCE AND TO GIVE DIRECTIONS TO INDIVIDUAL DRIVERS BY A RADIO COMMUNICATIONS SYSTEM. THE PROGRAM INCLUDES MULTI-MEDIA PROGRAMMED INSTRUCTION EQUIPMENT, AND A 12-PLACE DRIVING SIMULATOR, EQUIPMENT WHICH WILL MONITOR THE BASIC MOVEMENTS OF STUDENT DRIVERS IN EACH OF THE UNITS. THE PROGRAM IS DESIGNED TO PROVIDE AN IMPROVED DRIVER EDUCATION PROGRAM FOR 500 HIGH SCHOOL STUDENTS A YEAR IN A SIX-COUNTY AREA. THE RANGE WILL ALSO BE UTILIZED FOR THE INSTRUCTION OF FUTURE DRIVER-EDUCATON TEACHERS. THE RANGE WILL ALSO BE USED FOR SHORT COURSES AND SEMINARS TO TRAIN MANPOWER NEEDED BY THE STATE SUCH AS AMBULANCE DRIVERS, SCHOOL BUS DRIVERS, AND DRIVER IMPROVEMENT PERSONNEL.]]></description>
      <pubDate>Thu, 22 Sep 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/107658</guid>
    </item>
    <item>
      <title>DATA TRANSMISSION INVOLVED IN WISCONSINS INTEGRATED OPERATIONS SYSTEM</title>
      <link>https://trid.trb.org/View/90129</link>
      <description><![CDATA[THE WISCONSIN INTEGRATED OPERATIONS SYSTEM IS OUTLINED AND THE BASIC SYSTEM DISCUSSED: /1/ PROJECT DEVELOPMENT SYSTEM, /2/ PROGRAM BUDGET SYSTEM, /3/ FINANCIAL OPERATION SYSTEM, AND /4/ HIGHWAY NETWORK DATA AND INFORMATION SYSTEM.  THIS SYSTEM EVOLVED FROM THE CONCENTRATED EFFORT TO DEVELOP THE MOST APPROPRIATE, EFFICIENT, FLEXIBLE, LIVABLE, AND PRODUCTIVE ORGANIZATIONAL ARRANGEMENT AND OPERATING SYSTEM THAT CAN BE DEVISED FOR THE FUTURE MANAGEMENT OF THE HIGHWAY COMMISSION AND ITS PROGRAMS. THE SYSTEM IS COMPUTER ORIENTED AND PROGRAMMED.]]></description>
      <pubDate>Sun, 18 Sep 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/90129</guid>
    </item>
    <item>
      <title>MAJOR SHIFT IN TRANSPORTATION MODES FORESEEN OVER NEXT 25 YEARS</title>
      <link>https://trid.trb.org/View/35405</link>
      <description><![CDATA[The trend toward more energy-efficient forms of transportation is discussed in this summary of the market research study :Transportation Markets" published by Frost & Sullivan, Inc.  Statistics are given for future car populations, engine modifications, auto usage, freight transportation and mass transit by both rail and bus.  Some specific features of each of these areas are mentioned.]]></description>
      <pubDate>Tue, 10 Mar 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/35405</guid>
    </item>
    <item>
      <title>MATERIALS OPTIONS WITH RESPECT TO ENERGY RELATED SHORTAGES</title>
      <link>https://trid.trb.org/View/35404</link>
      <description><![CDATA[The energy shortage has forced assessment of alternative highway material sources such as coal tars, non-petroleum based materials, resins, and recycled substances.  The use of emulsions, of sulfur as a binder, more insitu stabilization and binders from wood resins is also investigated.]]></description>
      <pubDate>Wed, 10 Mar 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/35404</guid>
    </item>
    <item>
      <title>NATIONWIDE COSTS OF HIGHWAY MAINTENANCE AND OPERATIONS</title>
      <link>https://trid.trb.org/View/39425</link>
      <description><![CDATA[Technical notes are presented which provide insight into the subject of costs of highway maintenance and operations. The term "Highway Maintenance" is defined and expenditures for 1974 (estimated to be $6.21 billion) are discussed.  In the period 1973 to 1974 the states spent 16.5 to 16.7 percent of their total highway disbursements on maintenance and operations.  State, county and township disbursements are discussed, and the effect of inflation on expenditures is examined.  Expenditures are categorized into those for physical maintenance for roads and structures, traffic services, traffic control service facilities, and those for the operation of toll facilities.  The average per mile expenditure is reviewed, and factors which tend to increase maintenance costs, and future trends are outlined.]]></description>
      <pubDate>Wed, 10 Sep 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/39425</guid>
    </item>
    <item>
      <title>HIGHWAY NOISE ATTENUATION-A SHARED RESPONSIBILITY</title>
      <link>https://trid.trb.org/View/133588</link>
      <description><![CDATA[We have all become aware in recent years of noise as a pollutant and irritant in the human environment.  Since the source of the noise is the vehicles using the roads, one prime segment of responsibility should be the manufacturers of the vehicles.  This responsibility has been recognized by the industry to a degree, and some voluntary research is being performed toward producing quieter vehicles, especially trucks.  A bill has been introduced in Congress which, if it passes, will empower the Environmental Protection Agency to set and enforce noise standards for motor vehicles.  Some state legislatures have also been active in setting legal limits on vehicle noise.]]></description>
      <pubDate>Tue, 22 Oct 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/133588</guid>
    </item>
    <item>
      <title>STATE GOVERNMENT PERSPECTIVES ON LIGHT DENSITY RAIL OPERATIONS</title>
      <link>https://trid.trb.org/View/13287</link>
      <description><![CDATA[With the growth of our economy, service by complementary and sometimes competing modes of transport--highway and air--has also come about.  However, recent applications filed with the Interstate Commerce Commission leave no doubt that the desire exists to reduce substantially the mileage of rail track and thin that network of service in Wisconsin.  A look at the statistics shows that momentum is just gathering on track abandoment proceedings in Wisconsin.  Not only will the abandonment process accelerate, but the facilities and areas impacted will be of greater import than ever before in the state's transportation history.  What approach can a state such as Wisconsin take to the threat of large-scale abandonments?  What actions are possible; what tools are at hand:  In recognition of the variety of interests and conflicts in the entire situation, three basic factors stand out--the present carriers; the current shippers; and the rather formless shape bearing the mask of future generations.]]></description>
      <pubDate>Fri, 11 Jan 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/13287</guid>
    </item>
    <item>
      <title>IDAHO TOPS NATION</title>
      <link>https://trid.trb.org/View/109783</link>
      <description><![CDATA[IDAHO IS NOW THE TOP-RANKING STATE IN THE NATION IN JUNK CAR REMOVAL. OF 129 JUNKYARDS IN IDAHO THAT WERE WITHIN 1000 FEET OF INTERSTATE AND PRIMARY HIGHWAYS, 83 HAVE BEEN EITHER SCREENED OR REMOVED. NEGOTIATIONS ARE IN PROGRESS TO REMOVE ALL BUT 10 OF THE REMAINDER. IN THE LONG RUN, HOWEVER, DISPOSAL OF JUNK CARS WILL REMAIN A SERIOUS PROBLEM. SINCE 1971 THE ASIAN MARKETS FOR SCRAP STEEL HAVE CLOSED, AND THE DOMESTIC MARKETS HAVE SLOWED ALMOST TO A STANDSTILL. IN ADDITION, THE NUMBER OF ABANDONED CARS IS CONSTANTLY RISING. THESE TWO CONDITIONS SUGGEST THAT A NATIONAL COMMITMENT WILL BE REQUIRED TO CLEAR THE LANDSCAPE OF "METAL POLLUTION."]]></description>
      <pubDate>Mon, 07 May 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/109783</guid>
    </item>
    <item>
      <title>AUTOMATED DE-ICING SYSTEM</title>
      <link>https://trid.trb.org/View/110969</link>
      <description><![CDATA[DURING THE WINTER OF 1972--73 THE NEW YORK DOT WILL FIELD TEST A NEW METHOD OF SNOW AND ICE CONTROL ON A FOUR-LANE UPSTATE BRIDGE. AN ELECTRONIC SENSING DEVICE CONTINUOUSLY MONITORS TEMPERATURE AND HUMIDITY AT THE PAVEMENT LEVEL. WHEN THE READINGS INDICATE THAT SNOW IS FALLING OR ICE IS FORMING, THE SENSOR ACTIVATES A SERIES OF NOZZLES THAT SPRAY A SPECIAL FLUID, CALLED "ISOLV," ONTO THE DECK. THE FLUID IS MORE EFFECTIVE THAN SALT, DOES NOT CORRODE METAL OR DEGRADE CEMENT, AND WORKS AT MUCH LOWER TEMPERATURES THAN SALT. SINCE IT TENDS TO SOAK INTO THE PAVEMENT SURFACE, "ISOLV" PREVENTS FURTHER ICING FOR SEVERAL HOURS AFTER APPLICATION. THE SYSTEM IS CONNECTED TO TRAFFIC SIGNALS AT EITHER END OF THE BRIDGE SO THAT TRAFFIC IS HALTED DURING THE 30-SECOND APPLICATION PERIOD. THE LIQUID, WHICH CONTAINS NO PHOSPHATES, IS BELIEVED TO HAVE NO ENVIRONMENTAL SIDE EFFECTS.]]></description>
      <pubDate>Mon, 07 May 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/110969</guid>
    </item>
    <item>
      <title>DEER MIRRORS IN MISSOURI</title>
      <link>https://trid.trb.org/View/115302</link>
      <description><![CDATA[THE EFFECTIVENESS AND USE OF DEER MIRRORS BY THE MISSOURI HIGHWAY DEPARTMENT ARE REPORTEDLY FAVORABLE. THE NUMBER OF DEER-VEHICLE ACCIDENTS WERE CUT DOWN ENORMOUSLY WHILE IN USE. THE DEVICE CONSISTS OF TWO ROUND THREE INCH MIRRORS MOUNTED AT 45 DEGREE ANGLES ABOUT FOUR FEET ABOVE THE GROUND. THESE ARE INSTALLED ON A STAGGERED SYSTEM AT ABOUT 75 FT INTERVALS ON BOTH SIDES OF THE HIGHWAY DEPENDING ON THE TERRAIN BORDERING THE HIGHWAY AND THE NUMBER OF DEER CROSSING. HEADLIGHTS FROM PASSING CARS REFLECT AGAINST THE MIRRORS CAUSING LIGHT TO FLICKER SHARP, PENCIL-LIKE BEAMS STARTLING THE DEER AND CAUSING THEM TO STOP. ONCE THE LIGHT BEAMS STOP FLICKERING, THE DEER SAFELY CROSS.]]></description>
      <pubDate>Sun, 09 Jul 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/115302</guid>
    </item>
    <item>
      <title>A MINI-COMPUTER TRAFFIC SIGNAL CONTROLLER</title>
      <link>https://trid.trb.org/View/116932</link>
      <description><![CDATA[IN MARCH 1971 THE CALIFORNIA DIVISION OF HIGHWAYS PUT INTO OPERATION ON U.S. 50 NEAR SACRAMENTO A SIGNALIZED INTERSECTION CONTROLLED BY A PROGRAMMABLE, GENERAL-PURPOSE MINICOMPUTER THAT HAS THE FLEXIBILITY OF ADDING PHASES OR EXTRA LOGIC FEATURES TO AN INTERSECTION WITH ONLY MINOR PROGRAM CHANGES AND/OR ADDITIONAL PLUG-IN MEMORY. THE INTERSECTION OPERATION IS FULL TRAFFIC-ACTUATED, WITH FIVE VEHICLE AND THREE PEDESTRIAN PHASES. TRAIN MOVEMENTS ON ADJACENT RAILROAD TRACKS CAUSE PREEMPTION OF THE SIGNAL SEQUENCING. THE DIVISION IS NOW PREPARING PLANS FOR A PROTOTYPE CABINET THAT WILL ENCOMPASS ALL FEATURES FOR AN EIGHT-PHASE SIGNAL WITH PEDESTRIAN PHASES, RAILROAD PREEMPTION, AND FIRE EQUIPMENT PREEMPTION.]]></description>
      <pubDate>Sun, 02 Apr 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/116932</guid>
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