Automobiles 177 Congresses 109 Design and construction 72 Motor vehicles 60 Motors 44 Electronic equipment 38 Diesel motor 26 more ... Safety measures 21 Combustion 20 Pollution control devices 20 Trucks 20 Airplanes 17 Dynamics 17 Diesel motor exhaust gas 16 Electric vehicles 16 Fuel systems 16 Testing 16 Internal combustion engines 15 Space vehicles 15 Exhaust gas 14 Research 14 Safety appliances 14 Automatic control 12 Crashworthiness 12 Hybrid electric vehicles 12 Intelligent control systems 12 Jet propulsion 12 Motor fuels 12 Propellants 12 Propulsion systems 12 less ...