Bharat Stage 6 Emission Norms will require Real Driving Emissions as an additional type approval requirement from April 2023 in India. There is a significant requirement for reduction in exhaust gas emissions from Bharat stage 4 to Bharat stage 6. Several changes in engine constructions, tuning of the engine, valve, and ignition timing need to be adjusted. Moreover, after treatment device such as catalytic converter, selective catalytic reduction, Diesel particulate filter, exhaust gas recirculation needs to be adopted to meet these norms. Real Driving Emissions takes into account the road profile, the ambient conditions, traffic situations, drivers' behavior, and their influence on emission values. This new test requires equipment called Portable Emission Measurement system which comprises of exhaust flow meter, exhaust gas analyzer, global positioning system, ambient temperature, and ambient pressure sensor, OBD data acquisition device, and connection with vehicle ECU. The overall trip duration shall be between 90-120 minutes which consists of urban, rural, and highway driving. Thus accurate planning of route is required to reduce test failure risk and consequently experimental cost. When the driving conditions like ambient temperature and altitude are changed in order to check for different and extended conditions then there is a change in test results which are called extended test results. In recent studies, it was found that NOx emission was relatively higher compared to the expected result in urban conditions. This is due to constant low speed, deceleration, and acceleration. Thus conformity factor for NOx emissions varies from one emission regulation to another. The aim of this paper is to present the basics of Real driving conditions.