Safety First
This manual is the primary North American reference for quantitative road safety analysis.
What is the Highway Safety Manual (HSM)?
This roadway type provides direct property access, supports low speeds, and often hosts activities like street hockey.
What is a Local road?
This number, represented by the Greek letter π, is approximately 3.14.
What is pi?
This 1990s sitcom about six friends in New York became a Millennial comfort show.
What is Friends?
This regression model tool predicts the expected number of collisions for a site with given characteristics.
What is a Safety Performance Function (SPF)?
Includes features such as travel lanes, medians, sidewalks, and drainage, and describes how space is allocated horizontally across a roadway.
What is a Cross Section?
This type of energy is associated with an object’s motion.
What is kinetic energy?
This 1980s film about time travel and a DeLorean remains a Gen X classic.
What is Back to the Future?
This bias occurs when short‑term collision spikes are mistaken for long‑term safety problems.
What is RTM bias?
This pricing strategy increases the cost the longer a vehicle stays, encouraging parking turnover.
What is progressive pricing?
This electrical component resists the flow of current.
What is a resistor?
This 1970s sitcom about a working‑class family in Milwaukee became a Boomer and Gen X staple.
What is Happy Days?
This SPF parameter reflects the statistical reliability of the model and influences the EB weighting.
What is the dispersion parameter (k)?
This type of bottleneck occurs when vehicles must cross paths in a short distance, creating high lane‑changing demand and reduced capacity.
What is a Weave?
Equal to joules per mole‑kelvin, this constant links pressure, volume, and temperature in the ideal gas law.
What is the universal gas constant (R)?
This 1980s cartoon, beloved by Gen X, featured heroes shouting “By the power of Grayskull.”
What is He‑Man and the Masters of the Universe?