How Stuff Works - HowStuffWorks explains hundreds of subjects, from car engines to lock-picking to ESP, using clear language and tons of illustrations.
Martindale's calculators on-line center: automobile, truck, motorcycle & locomotive - New & Used Car Pricing ~ Safety, Defects, Recalls, Accidents, Crash Investigations ~ Traffic Noise, Measurement & Torque ~ How a Car Works, Automotive Design & Development, Diesel Engine ~ Electric & Hybrid Eng., Internal Combustion Engine ~ Stirling Engine, Steam Engine Design, Steam Engine Auto ~ Steam Engine Locomotive, Steam Engine Steamboat, Fire Engine Design, Motorcycles & Motor Scooters, Axel ~ Cams & Pistons ~ Car Stereo ~ Drag Speedway Racing, Emissions ~ Horsepower, Chassis, Gears, Etc. Paint ~ Shocks ~ Tire & Wheels ~ Towing ~ Turbocharging, Fuel: Costs & MPG ~ Lease, Loans, Finance & Taxes.
Top Gear - web site of the BBC programme.
UK Statutory Instruments - With effect from the first printed Statutory Instrument of 1987, the full text of all published Statutory Instruments are available on this website.

Links checked 18-11-10