102 0 grade 104 and u2212 3 grade 106 these latter figures will be explained in detail below a preferred embodiment of the electric vehicle power management amp driver control system will now be described in detail as outlined above the primary factors affecting efficient use of battery power in full or serial hybrid electric vehicles include vehicle mass amp road grade vehicle speed amp acceleration recharging profile amp braking and use of vehicle accessories adaptive power management is used while the vehicle is driving for instance if the vehicle is driving downhill then the power requirements kw are substantially less and the power available can be scaled back further depending on the road grade measured by the inclinometer 38 as shown by the plot in fig4 the power required to drive an electric vehicle up a 3 grade 102 is substantially higher than 0 grade 104 and substantially lower if driven down a u2212 3 grade 106 also shown in fig4 is the fact that more power is required to operate an electric vehicle as its mass increases as measured by the vehicle mass sensor 36 fig2 demonstrates the basic operation of a representative transit vehicle employing the disclosed.