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Go to Editorial ManagerThe negative impacts of road traffic congestion in the Smart City environment are the subject of this study. Although the postponements are not entirely new, they are a well-known issue that affects a large portion of the worldwide population through pollution and postponements. In order to maintain flow and prevent traffic bottlenecks, there is a higher need for traffic management due to the growing urbanization and number of motorized motor vehicles. We use Peshawar Chowk, being one of Pakistan's most important urban and economic centers, it was chosen as a pilot research location. It is experiencing an uncontrolled phase of fast urbanization and motorization. The study first examines sustainable transportation systems to comprehend the idea of environmentally friendly transportation. The research then assesses to determine the most sustainable kind of transportation, considering Pakistan's current urban transportation and transportation infrastructure. Using AIMSUN software, the best option for a more environmentally friendly transportation system may be found. We do this by comparing the criteria and alternatives in pairs. A survey questionnaire is used to conduct this pair-wise comparison.
The use of nanomaterials in asphalt binders has become a very promising approach to improve the performance of pavements under growing traffic and environmental load. This research focuses on the influence of zinc oxide (ZnO) nanoparticles on physical and rheological properties of asphalt binder. ZnO was added in dosages of 1%, 3%, 5% and 7% by binder weight in a high shear mixing process. The modified and control binders were tested for their physical properties (penetration, softening point, ductility, flash point and viscosity), Dynamic Shear Rheometer (DSR) tests for rutting and fatigue performance and Bending Beam Rheometer (BBR) testing for low temperature behaviour. The results showed that the addition of ZnO nanoparticles reduced penetration and increased softening point, flash point and viscosity, which indicated the improvement of stiffness and thermal stability. Ductility was not affected, which confirmed that flexibility was maintained. Rheological analysis revealed that rutting resistance was significantly improved and a 76.7% reduction in the fatigue factor was observed in intermediate temperatures, whereas BBR results revealed acceptable low-temperature performance. The Performance Grade (PG) of the binder was improved up to two grades in higher contents of ZnO without exceeding limits for workability or thermal cracking. These results show that ZnO nanoparticle is an efficient asphalt modifier that enhances thermal, mechanical and rheological properties and thus can be used in high performance pavements applications with a wide range of temperature.