Optimization of Green-Times at an Isolated Urban Crossroads

We propose a model for the intersection of two urban streets. The traffic status of the crossroads is controlled by a set of traffic lights which periodically switch to red and green with a total period of T. Two different types of crossroads are discussed. The first one describes the intersection of two one-way streets, while the second type models the intersection of a two-way street with an one-way street. We assume that the vehicles approach the crossroads with constant rates in time which are taken as the model parameters. We optimize the traffic flow at the crossroads by minimizing the total waiting time of the vehicles per cycle of the traffic light. This leads to the determination of the optimum green-time allocated to each phase.Comment: 8 pages, 6 eps figures, more explanation added. To appear in EPJ

Crossroads Rhode Island: Proposed Social Enterprise Business Plan

Crossroads Rhode Island provides their clients with a continuum of care that includes basic emergency needs, shelter, housing, case management and vocational services for individuals and families. In order to provide these services they rely on the generosity of their donors and supporters who have helped Crossroads to become the largest homeless services organization in Rhode Island. It is important to Crossroads that they stick to their core values of safety, respect, and effectiveness when helping the homeless or at-risk individuals and families secure stable homes

El Paso economy sluggish in 2007: U.S. slowdown outweighs Fort Bliss expansion

This has been a disappointing year for El Paso in terms of job growth. Through October, the city added only 1,200 new wage and salary jobs, according to seasonally adjusted data, an annualized growth rate of less than 1 percent. The seasonally adjusted unemployment rate remained at a historically low level of 5.4 percent in October, but progress in lowering the rate further stalled at midyear.Mexican-American Border Region - Economic conditions

Seizing the Second Chance in EU-Armenia Relations

For much of its history, Armenia has been a prisoner of its difficult geography. Situated at a strategic crossroads, it has lost out in competition with much larger regional powers and empires, and was the victim of the first genocide of the 20th century. Armenia is now at a crucial political crossroads yet again, this time with the fate of the country’s strategic orientation and domestic stability in the balance

Low-wage occupations remain a hallmark of El Paso economy

Textile industry ; Education

Fluid Borders, Concrete Locations: Epicenters of Cross-Cultural Interaction in the Eighteenth Century Borderland of the Great Lakes

In a recent article on the advent of borderlands history as a prominent field of historical scholarship, Pekka Hämäläinen and Samuel Truett described borderlands as “realms where boundaries are also crossroads, peripheries are also central places, homelands are also passing-through places, and the end points of empire are also forks in the road.” One such region that certainly fits this definition of a borderland and unquestionably hosts such specific crossroads and cultural junctions is the maritime region of the Great Lakes of North America. [excerpt

Crossroads, Summer 2001

Newsletter for Iowa Department of Public Safet