![]() ![]() Innovation is key, and the Environment Agency is here to support that through progressive regulation. ![]() The CCA scheme is encouraging businesses to find ways to reduce their energy usage and consequently their carbon emissions. ![]() Sir James Bevan, Chief Executive of the Environment Agency, said: The EA's latest biennial report, published online, also shows that, between 20, the CCA scheme has seen total emissions savings of 23.8 million tonnes of CO2 equivalent. This equates to an overall emissions reduction of 13.3% across a total of 8,705 facilities signed up to the scheme, which is administered by the Environment Agency on behalf of the Department for Business, Energy and Industrial Strategy (BEIS). The results can also be beneficial for other countries within the region.The Climate Change Agreements (CCA) scheme, which offers tax benefits to firms which agree to energy efficiency targets, saw a collective reduction in emissions of 6.6 million tonnes of carbon dioxide equivalent during 20. US EPA MOVES was calibrated to Qatar conditions which can be used to estimate emission factors and quantify vehicular emissions along other corridors in the country. Intersection geometries along with the control type have significant impact on emission rates and play a major role in assessing environmental impacts. Implications: A microscopic simulation approach using VISSIM and MOVES was developed to assess the environmental effect of converting four three-lane roundabouts to signalized intersections along a heavily congested urban corridor in Doha, Qatar. Both recorded nearly the same emission rate. ![]() The results also revealed that there was no significant difference between emission rates in the vicinity of the two types of control. Immediate roundabout upstream approaches are driver behavior dependent, characterized by substantial coasting at lower speeds and subsequent re-accelerating with less idling, described as acceleration events, which resulted in high emission rates, while signalized corridors are signal timing dependent, characterized by ample idling with less coasting and re-acceleration, resulting in reduced emission rates. A more detailed analysis revealed that roundabout corridor operations' effects on emission rates are divergent from those of signalized corridors, particularly upstream and downstream of the intersections. Preliminary results indicated that the signal control outperformed the roundabout in the range of 37% to 43% reduction in emissions. A decision was made to switch all roundabouts to traffic signals for better operations. In this study, a microscopic simulation approach using VISSIM and MOVES was developed to assess the environmental effect of converting four three-lane roundabouts to signalized intersections along a heavily congested urban corridor in Qatar. However, there are other important factors that affect major arterials operational characteristics, factors that are not fully addressed, such as the impact of emissions. Different predefined procedures are available to calculate some of the main operational characteristics, such as capacity, delay, and level of service, in order to select the best type of control. The type of control at intersections has a major effect on the operation of any urban corridor. ![]()
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