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Problem statement: This study discusses the development of computer software of two&#13; phases. First phase contains the calculations of all curve elements of the four types of the horizontal&#13; curve and second phase contains the modeling of the ten methods of estimating the radius of the&#13; horizontal curve. Approach: The program is named as HCRET, which stands for Horizontal Curves&#13; and Radius Estimating Techniques. The program is written in Visual Basic-Version 6 language. The&#13; developed program deals with the calculation of all elements of the horizontal curve of the four types&#13; of the horizontal curves, which consists of simple, compound, reverse and transition. Results: The&#13; program also used for modeling of the ten methods of radius-estimating of horizontal curve, which&#13; consist of Ball Bank Indicator, Chord Length, Compass, Lateral Acceleration, Plan Sheet, Advisory&#13; Speed Plate, Modified Yaw Rate, Field Survey, and Global Positioning System for the calculation of&#13; estimated-radius. The program output is comprehensive and easy to understand, while the program&#13; input is used friendly and provided with many graphical objects to facilitate ease of use. A case study&#13; of three examples presented to evaluate the modeled software of three horizontal curves. Two curves&#13; were located in university of Baghdad and a third curve was designed and includes also the&#13; experimental work of radius-estimating methods of horizontal curves as follow field survey, plan&#13; sheet, compass, Global Positioning System (GPS). Conclusion/Recommendations: The results that&#13; obtained of the three curves by using the radius-estimating methods include the true and estimated&#13; radius of each method. The field survey and the plan sheet method provided the most accurate result&#13; 0.8002 and 0.8660 respectively. The plan sheet method and GPS method is preferred, because plan&#13; sheets are easily accessible to these users and GPS is the accurate field method. While the compass&#13; method is not the accurate, it is easy to use, and has a low cost

Developing a Computer Program for the Methods of Radius-Estimating Techniques for Horizontal Curves