This novel system focuses on the accessibility and processing of elevation and slope data for roads traveled by trucks & buses. It is to be used primarily for applications with shift advisor and predictive algorithms. Ways to estimate road slope have been proposed in many papers. Some of the cases, road slope is measured by GPS. Some of them talk about the use of pressure sensor to get the barometric pressure drop to estimate the road slope. One other way to predict road slope by monitoring the engine torque.