sidra intersection estimates the cost, energy and air pollution implications of intersection design using a four-mode elemental model with detailed acceleration, deceleration, idling and cruise elements. this drive-cycle (modal analysis) method coupled with a power-based vehicle model is used to estimate operating cost, fuel consumption, greenhouse gas (co2) and pollutant (co, nox, hc) emissions in order to assess the environmental impacts of traffic congestion. the model includes estimates of acceleration and deceleration times and distances for light and heavy vehicles coupled with a polynomial model of acceleration-time profile. the vehicle parameters in the model have been updated recently for modern vehicle fleet.