PURPOSE To analyze static visual field sensitivity with topographic models of the hill of vision (HOV), and to characterize several visual function indices derived from the HOV volume. METHODS A software application, Visual Field Modeling and Analysis (VFMA), was developed for static perimetry data visualization and analysis. Three-dimensional HOV models were generated for 16 healthy subjects...

Clustering is a major technique in data mining. However the numeri-cal feedback of clustering algorithms is difficult for user to have an intuitiveoverview of the dataset that they deal with. Visualization has been proven to bevery helpful for high-dimensional data analysis. Therefore it is desirable to in-troduce visualization techniques with user’s domain knowledge into cluste...

A methodology for evaluating and quantifying the benefits/ costs of converting a given High Occupancy Vehicle (HOV) lane into a High Occupancy/ Toll (HOT) lane is presented in this study. A mathematical programming model that seeks the optimal pricing strategy, using a logit-like choice model embedded as constraints, forms the core of the methodology. A salient feature of this study is the inco...

Interstate 95 (I-95) is the major northsouth traffic artery for much of’ the eastern United States. In the Washington, D. C., area 1-95 joins I-495 (the Capital Beltway) to carry an extraordinary volume of the region’s traffic. In Northern Virginia, I-95 runs through Fairfax County, where it figures heavily in morning and afternoon commuting for thousands of motorists. The cumulative demand far...

A variety of policies to encourage carpooling in high-occupancy vehicle (HOV) lanes have been adopted by state and local governments in the US. These policies can either increase or decrease total congestion depending on whether congestion relief in mainline lanes outweighs increased HOV lane congestion. We estimate congestion cost functions for mainline and HOV lanes in Los Angeles and find co...

This study addresses safety issues associated with the operation of freeway high-occupancy vehicle (HOV) lanes that are not'separated by physical barriers from adjacent, general-purpose traffic lanes. Accident frequencies and characteristics obtained from 14 months of operation of an HOV lane in the greater Los Angeles area, together with similar data for 6 years' prior to the opening of the la...

Traffic congestion is a significant social concern that is credited with considerable economic costs, wasted time, and associated public health risks. Efficient ridesharing solutions could help mitigate congestion. Some of the actions government agencies have taken encourage ridesharing include the availability of High Occupancy Vehicle (HOV) lanes and existing policies of discounted toll rates...

A procedure for constructing and calibrating a detailed model of a freeway using VISSIM is presented and applied to a 15-mile stretch of I-210 West in Pasadena, California. This test site provides several challenges for microscopic modeling: an HOV lane with an intermittent barrier, a heavy freeway connector, 20 metered onramps with and without HOV bypass lanes, and three interacting bottleneck...