No abstract

This study reports the findings of a tion concerning the effect of asphalt content, aggregate gradation, and the cement) on the design parameters and p treated mixtures (AETM)

Speed limits have been established for the good of the motoring public, primarily for purposes of safety. A study has shown that by reducing the number of violators on freeways, the resulting more uniform speeds contribute to improved capacity and safety (22). The effectiveness of a speed limit on a facility depends on the degree of enforcement and public support (3,4). The public will support and obey speed limits that are safe and reasonable; however, speed limits that are illogically restrictive cannot be enforced except by tremendous effort and expense, and then usually not for 1 ong (3). It is the duty of traffic engineers to establish speed limits by careful investigation and evaluation. The most commonly used method of establishing speed limits is to take the 85th percentile of the observed speeds (32,26). J. C. Oppenlander suggests another method of establishing the best operating speed by optimizing the three resources expended in highway transportation: the economics of vehicle operation, the value of time, and the safety of travel (33). Driver Characteristics The speed a driver chooses is dependent upon his desires and environment; therefore, speed control is difficult because of variations in the driving behavior of individuals (3,22).

Attached is a final report covering the research carried out by Mr. Atef Gadallah during the past year on predicting liquid and plastic limits of soils using the moisture-tension device.The research was conducted in two basic parts. The second part of the research dealt with checking the mathematical model discussed above using a total of 144 samples selected in a randomized manner. The results of this series of tests showed good correlation for the liquid limit and fair correlation for the plastic limit. FirstThe research indicated that the moisture-tension device shows good promise for predicting the consistency limits. Additional research should be conducted to further check this out.We will submit a work plan on this in the future.

The results indicate an increase of 0.9 mph in the average speed of all passenger cars and an increase of 2,2 mph for heavy trucks to that of the 1974 study.