The biggest source of noise pollution nowadays is traffic noise. The noise from traffic has an impact on the people who live close to the highway. Given the speed at which things are developing, it is imperative to investigate the highway traffic noise concerning the primary causes. Determining the passenger car noise equivalent (PCNE) for each class of vehicle concerning the highway design speed on Indian highways is the primary goal of this study. The term PCNE refers to the number of reference vehicles with noise emission characteristics that are equivalent to a particular vehicle type. Furthermore, the reference energy mean emission level (REMEL) equation has been developed for every vehicle category. Data for four distinct vehicle classes—high commercial vehicles, light commercial vehicles, motorcycles, and automobiles with bituminous pavement—were gathered at four different highways. According to the study, the passenger car noise equivalent (PCNE) value should be used to analyze the traffic noise since it may convert the diverging traffic volume into passenger cars.