Category 1
On level terrain, this is the major source of power loss for bicyclists.
What is wind resistance?
A bus with an upper deck above the normal seating area is known as this.
What is a double deck bus?
From 1970 to 2005, vehicle miles traveled have increased by this proportion in the United States - doubled, tripled, or quadrupled.
What is tripled?
This methane-based fuel has been used as a fuel for racing cars for years.
What is methanol?
Three types of buses classified by function are intercity buses, local transit buses, and these.
What are school buses?
The coefficient of friction at the tire-pavement contact surface is a function of pavement type, tire condition, and whether the pavement surface is this.
What is wet or dry?
This type of combination truck trailer has one or more axles at its front and rear ends.
What is a full trailer?
This type of vehicle uses an internal combustion engine combined with storage batteries and electric motors for propulsion.
What is a hybrid?
Vehicle emissions include carbon monoxide (CO), nitrogen oxide (NOx) and these, abbreviated VOC.
What are volatile organic compounds?
This fuel is also popular for outdoor cooking
What is propane?
A bus with a permanently attached trailer and full interior passenger circulation is known as this.
What is an articulated bus?
Vehicle clearance intervals for traffic signals are based on this comfortable deceleration rate - either 10, 20, or 30 feet per second squared.
What is 10 feet per second squared?
This type of combination truck trailer has one or more axles only near its rear end.
What is a semitrailer?
Which of the following yields the highest rolling resistance for a passenger car: smooth pavement, broken and patched asphalt, dry, well-packed gravel, or loose sand.
What is loose sand?
A law which permits drivers to be pulled over for not wearing seatbelts is called this.
What is a primary seat belt law?
The AASHTO Publication "A Policy on Geometric Design of Highways and Streets" is better known as this.
What is the Green Book?
E85 is a blend of gasoline and this.
What is ethanol?
ITE guidelines for subdivision streets recommend the use of this radius for cul-de-sacs.
What is 50 feet?
Any passenger vehicle that can transport more than 15 people is classified as this.
What is a bus?
The phenomenon which, at low speeds, the rear wheels of a vehicle do not follow the same path as the front wheels.
What is offtracking?
These devices help reduce the effects of a side impact on occupants of a vehicle.
What are side-impact air bags?
The FHWA vehicle classification scheme includes this many vehicle types.
What is 13?
This is the nominal horsepower of a representative passenger vehicle and pick-up truck.
What is 200 horsepower?
This is generally the smallest vehicle used in design of public roadways.
What is a single-unit (SU) truck, or straight truck?
A transit bus propelled by electricity obtained from overhead wires is known as this.
What is a trolley bus?
In general, the rolling resistance of a passenger car does this as speed increases.
What is increases?
Term for a vehicle that is capable of using either 100% gasoline or a blend of 85% ethanol and 15% gasoline.
What is flex-fuel?
A single word which defines a tractor and trailer joined at a hitch point where the units can rotate laterally.
What is articulated?
This is the primary resisting force against a vehicle traveling at high speeds.
What is air?
Beginning in the year 2005, this type of vehicle has outsold passenger cars in the U.S.
What are light trucks?