One person.
An entire car.
A seat for you. A machine around you. Now multiply that bargain by everyone trying to get somewhere.
Deep Dive · Space, energy & the cost of empty seats
60 bus passengers.
32 people in all those cars.
The people stay.
The cars don’t have to.
Put those same 60 people four to a car: 15 cars instead of 60. Give them a bus carrying 60 passengers: one passenger vehicle, with a driver too. The travelers have not vanished. The vehicles have.
A city’s job is to connect people to places. Counting how many cars get through tells only part of that story.
Each dark segment is a range, on the same zero-based scale. A lane about 10 feet wide (3 meters in the source), or equivalent width, at peak conditions with normal operations. These are design-guide capacities, not average ridership or a promise for every street. The private-vehicle range is not restricted to solo drivers. A two-way bikeway counts both directions. NACTO/GDCI, PDF p. 23; scope and assumptions.
A high-capacity transitway is a different facility from a bus sharing traffic. Stops, signals, service frequency, occupancy and safe access all matter. Space for walking and cycling also means space for trips that need no car at all.
So much energy.
So little motion.
For a conventional gasoline vehicle on the DOE/EPA combined city–highway cycle, about 18–25% of the fuel’s energy reaches the wheels. Most is lost in the engine, primarily as heat. And the wheels move the whole vehicle, along with whoever is inside.
Band widths show the 25%-to-wheels case; the remaining 75% is 100% minus 25%. Estimated combined cycle: 55% city, 45% highway. A range across vehicles, not a measurement of your trip. DOE/EPA: where the energy goes.
Electric cars change this part of the story. DOE reports 87–91% efficiency including energy recovered through regenerative braking. That vehicle-level figure does not include electricity generation or manufacturing. Electrifying a car still leaves a car to accommodate.
Occupancy changes the denominator. Energy per passenger-distance is vehicle energy divided by the people carried. A well-used bus can spread its energy use over many riders; a nearly empty one may not. Vehicle technology, route and occupancy decide the comparison. DOE’s EV explanation.
One person.
A much smaller appetite.
For the same distance, how much energy goes in? Here’s an illustrative gasoline car beside a conventional bicycle, measured per person carried.
Fuel energy for the car. The rider’s estimated total metabolic energy for the bike. Both expressed in watt-hours.
Move right for a more efficient car.
Includes the driver. Fuel use is held fixed as occupancy changes.
Bike held fixed: 154 lb rider at 11 mph, using the 2024 Compendium’s 6.8-MET cycling category. About 43.3 dietary Calories per mile.
A model, not a measured trip or an individual calorie prediction. The bike value includes resting metabolism while riding; the car value excludes occupants’ metabolism. Neither includes producing the food or gasoline, building the vehicles or roads, or any emissions estimate. Wind, hills, riding style, the rider and driving conditions change the result. This is not a measure of energy reaching the wheels.
The assumptions and calculations
The baseline car gets an assumed 30 miles per US gallon (7.84 L/100 km) with one person aboard. Using DOE/EPA’s 33.7 kWh per US gallon: 33,700 ÷ 30 = 1,123.3 Wh per vehicle-mile. Divide by occupancy for energy per person-mile.
The bike model uses a 70 kg adult at an assumed 11 mph (17.702784 km/h), within Compendium activity 01020’s 10–11.9 mph category, rated at 6.8 METs. Using 1 MET ≈ 1 kcal/kg/hour: 6.8 × 70 ÷ 11 = 43.27 kcal/mile. With 1 kcal = 4,184 joules and 1 Wh = 3,600 joules, that is 50.29 Wh/mile. This is gross metabolism, not a prediction of extra food eaten. The Compendium is standardized for adults aged 19–59 and does not predict an individual’s precise expenditure.
Divide both per-mile values by 1.609344 for per-kilometer values: 698.01 Wh for the solo car and 31.25 Wh for the bike. Their ratio is about 22.34 before display rounding. Both bars begin at zero and use the same fixed scale. Changing units does not change their lengths or ratio.
| Direct energy input | Wh/person-mile | Wh/person-km |
|---|---|---|
| Gasoline car · 30 US mpg | 1,123.33 | 698.01 |
| Bicycle · 70 kg, 11 mph | 50.29 | 31.25 |
Download the baseline calculation (CSV)
Sources checked October 6, 2026: 2024 Compendium: cycling category 01020; MET definition and reuse terms; limits of individual estimates; DOE/EPA energy equivalence; NIST: calories and joules.
Heavy metal.
Fragile people.
A moving car carries energy that has to go somewhere when it stops. A vehicle twice as heavy carries twice the energy at the same speed. Double the speed and that energy quadruples. People outside the vehicle do not have a steel cabin around them.
Roughly 3 stories high.
That’s 2 US tons falling. More weight means more energy at the same height.
How the comparison works
The selected vehicle carries 120,345 foot-pounds of kinetic energy—2.25 times its energy at 20 mph. An ideal fall of 30.1 feet gives the same mass the same energy.
For the visual height reference, each story is 10 feet. Actual floor heights vary. Vehicle weight is illustrative, not a fleet average.
An energy equivalence, not a crash or injury simulation. Ideal free fall from rest; air resistance ignored. Vehicle drawing is a symbol, not a scale model.
The energy is real.
The harm is not inevitable.
In a collision, energy can go into deformation, movement and heat. What happens to a person also depends on impact speed, vehicle shape, contact and how the collision unfolds. An energy calculation cannot predict someone’s injuries.
NHTSA links higher speeds and larger vehicles to greater dangers in crashes. Lower speeds, safer vehicles and streets designed around people matter alongside better alternatives to driving.
And before it moves,
it has to be made.
A vehicle also represents materials and manufacturing. Sharing an existing car uses the same machine for more travelers; it does not erase its production footprint. Replacing solo trips with fewer vehicles creates an opportunity to need fewer machines and less space to store them. Actual savings depend on what is built, how long it lasts and whether shared travel replaces ownership and driving.
Energy = ½ × mass × speed². Equivalent drop height = speed² ÷ (2 × gravity), using gravity ≈ 32.2 ft/s². Switch units to see kilograms, km/h, meters and kilojoules; the underlying scenario stays the same. OpenStax: kinetic energy · Gravitational energy. These are idealized calculations, not a stopping-distance, collision-force or injury model.
Bring life
closer.
More homes near the places we need.
Public transit that makes the connection.
A neighborhood built around living.
Homes above shops. A bus corridor between them. Connected sidewalks, protected cycling and safe crossings make the neighborhood a whole.
The interactive model is optional; the design principles are explained below.
Original design sketch, not a real place or a simulation. Building heights, people, vehicles and distances are illustrative. No travel-time, housing-capacity or emissions result is implied. Trader Joe’s sign identifies an illustrative shop; this is not an actual store or an endorsement.
Put more life
within reach.
Allow more homes near shops, services and transit. Mix uses. Connect the blocks. Compact, mixed-use neighborhoods make walking, cycling and transit more convenient. Density can look like the apartments above a grocer, the rowhomes around a corner, the everyday places along a bus route.
Make transit
worth choosing.
A painted lane is only a start. The proposal here pairs dedicated bus space with frequent, reliable service, accessible stops and safe crossings. Build the neighborhood and fund the service together. EPA: connecting land use and transportation.
The goal is a place
you can live in.
Make room for more neighbors, different housing needs, and the people already there. Keep access for disabled people, deliveries and trips that still need a car. Give people a real alternative for the trips that do not.
A home near daily life.
A bus worth waiting for.
A street worth walking down.
Inspired by Bill Nye’s Human Transportation. The next step is a question of design: how do we make it easier to get where life happens?
The sources, the assumptions, the numbers
Different questions, different measures. The opening counts vehicles. The lane chart compares people per hour. The energy graphic compares fuel energy reaching the wheels. The mass-and-speed demonstration calculates translational kinetic energy and an equivalent ideal free-fall height. The source table separately allocates illustrative vehicle mass per occupant. None is a complete environmental score.
| Occupancy | Vehicles | Vehicle lb/person | Vehicle kg/person |
|---|---|---|---|
| 1 per car | 60 | 4,000 | 1,814.37 |
| 2 per car | 30 | 2,000 | 907.18 |
| 3 per car | 20 | 1,333.33 | 604.79 |
| 4 per car | 15 | 1,000 | 453.59 |
| 60 bus passengers | 1 bus | Not modeled | Not modeled |
Car calculations: 60 ÷ occupants; 4,000 lb (1,814.36948 kg) ÷ occupants. Mass allocations in the table are rounded to two decimals. The mass-and-speed controls instead use kinetic energy = ½mv², with mph × 0.44704 to convert to m/s; equivalent free-fall height = v²/(2 × 9.81). Pounds are converted to kilograms with lb × 0.45359237; joules to foot-pounds with J ÷ 1.3558179483314004; meters to feet with m ÷ 0.3048. US mode displays whole foot-pounds and metric mode displays kilojoules to one decimal; detailed height is shown to one decimal in either feet or meters; calculations use unrounded values. A 4,000 lb vehicle at 20 mph carries 53,487 foot-pounds, at 40 mph 213,947 foot-pounds: exactly four times the energy before display rounding. Ideal drop time = v/9.81. These calculations omit wheel rotation and air resistance, and predict neither collision force nor injury. The bus adds an operator; it does not claim every bus has this capacity or occupancy. Vehicle silhouettes are schematic, with no distance, area or traffic-gap scale.
| Mode/facility | Range |
|---|---|
| Private motor vehicles | 600–1,600 |
| Two-way protected bikeway | 6,500–7,500 |
| Dedicated transit lanes | 4,000–8,000 |
| Sidewalk | 8,000–9,000 |
| On-street transitway, bus or rail | 10,000–25,000 |
Ranges are planning guidance from the 2016 Global Street Design Guide, reproduced in Fabrizio Prati’s 2018 NACTO/GDCI presentation, PDF page 23. They are not measured 2026 flows or confidence intervals. Facility types and directions differ as labeled; the two-way bikeway includes both directions. No minimum/maximum ratio is presented as a guaranteed improvement.
Gasoline: DOE/EPA’s combined-cycle diagram estimates 18–25% to the wheels; the page’s broader 12–30% headline spans different drive cycles. EV: DOE’s September 16, 2024 summary reports 65–69% to wheels plus about 22% net regenerative recovery, yielding 87–91%. Do not multiply a passenger’s fraction of vehicle mass by either efficiency figure: drag, rolling resistance and other loads make that an invalid allocation of useful energy.
Download values and assumptions (CSV)- Global Street Design Guide — operating conditions and lane width
- NACTO/GDCI presentation — capacity graphic, PDF page 23
- DOE/EPA — gasoline energy flows, combined city/highway diagram
- DOE — EV efficiency including regenerative braking, 2024
- EPA — compact development, mixed uses and transit-oriented neighborhoods
- OpenStax — kinetic energy and speed squared
- OpenStax — gravitational energy and equivalent height
- NHTSA — speed, vehicle size and crash harm
- Bill Nye — official episode page, inspiration rather than a numerical source
The neighborhood is an original architectural design sketch. Its view buttons change the camera, not measured conditions or predicted outcomes. The qualitative relationship between compact mixed-use development and transportation options follows EPA guidance; the proposal for investment and service is editorial. The Trader Joe’s logo is sourced from its official store-location site and belongs to Trader Joe’s; no affiliation is implied. All other illustrations and calculations are original to weird.stats. No episode footage or source artwork is reproduced. Sources checked October 6, 2026. This essay combines illustrative models, engineering estimates and editorial interpretation; it does not estimate a city’s emissions savings.