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Driving in 2021 Was 225 Percent Safer than in 1970

Blog Post | Motor Vehicles

Driving in 2021 Was 225 Percent Safer than in 1970

Deaths per traffic mile have decreased by 69.3 percent while miles per gallon increased by 95.4 percent.

Summary: Over the span of five decades, advancements in vehicle safety technology have contributed to substantial improvements in traffic safety. Meanwhile, significant enhancements in fuel efficiency have been achieved. If you define travel abundance as a combination of these two factors, then abundance has increased by 596 percent.


Between 1970 and 2021, the rate of traffic deaths for every 100 million miles driven decreased by 69.3 percent, from 4.88 to 1.50, according to the National Safety Council.

Vehicle miles driven increased 179.8 percent from 1.12 billion miles in 1970 to 3.13 billion in 2021. During this same period, the number of deaths decreased by 14 percent from 54,633 to 46,980.

This graph shows an increase in miles driven over time with the death rate per mile decreasing.

If traffic safety hadn’t improved since 1970, there would have been 152,842 traffic deaths in 2021 instead of 46,980. Adjusted for miles driven, for every traffic death in 2021, there were 3.25 in 1970 (4.88 ÷ 1.5 = 3.25).

The opposite of the death rate would be the life safety rate. If we index traffic safety at a value of 1 in 1970, the rate would be 3.25 in 2021. Measured from this perspective, 2021 was 225 percent safer than 1970. Vehicle safety has been increasing at a compound annual rate of 2.34 percent, doubling every 30 years.

The graphs show that, despite the increase in the number of vehicles, both the total number of vehicle deaths and the death rate relative to the population have decreased.

Cars and drivers are both getting safer by getting smarter. Cars today have three-point seat belts, air bags, stability control, backup cameras, blind spot detection, anti-lock brakes, radial belted tires, headrests, tire pressure monitoring, automatic emergency braking, lane departure warning, adaptive headlights, adaptive cruise control, and anchors for child seats.

We also get much better mileage. The full-size Ford Galaxie took the number-one spot in sales for 1970. It got 13 to 16 miles per gallon. Today’s bestseller is the Honda CRV, which gets 28 to 34 miles per gallon. Gas mileage has increased by 114 percent while safety has improved by 225 percent. If you define travel abundance as a combination of these two factors, then abundance has increased by 596 percent.

The figure shows that travel abundance and the life safety factor are much higher in 2023 than 1970.

This article was published at Gale Winds on 4/24/2024.

Axios | Air Transport

Passenger Jet Prototype Breaks Speed of Sound

“A prototype of a passenger jet designed to succeed the supersonic Concorde broke the sound barrier for the first time on Tuesday above the Mojave Desert in California.

Why it matters: Exceeding Mach 1 speed — 770 miles per hour — is an important milestone in the quest by Boom Supersonic, a Denver-based startup, to resurrect high-speed air travel 22 years after the Concorde retired.”

From Axios.

Live Science | Air Transport

XB-1 Passenger Plane 1 Step Away from Breaking the Sound Barrier

“The unofficial successor to Concorde is one step closer to reality after Boom Supersonic marked the 11th successful test flight of its XB-1 supersonic demonstrator aircraft.

On Jan. 10, the XB-1 completed a sustained flight at 728 mph (1,172 km/h) — equivalent to Mach 0.95, which is just shy of the speed of sound.

The test was conducted at a height of 29,481 feet (8,986 meters); while the aircraft flew at this speed in its 10th test, that test was at a much higher altitude and therefore a lower air pressure.

By flying so fast, so low in the latest test, the XB-1 achieved a record 383 knots equivalent airspeed — indicative of incredibly high dynamic air pressure. The aircraft will never experience such intense conditions again even when it finally breaks the sound barrier, as its in-service flights will take place at much higher altitudes where the air is thinner, company representatives said in a statement.

Putting the aircraft under this strain at transonic speed, just below the speed of sound, demonstrates the robust quality of its airframe and proves it will remain controllable at higher speeds.”

From Live Science.

Wall Street Journal | Motor Vehicles

How Uber and Lyft Are Gearing Up for the Robotaxi Revolution

“Uber Technologies and Lyft gave up on big plans to develop their own driverless taxis years ago. Now, they are revamping their businesses to accommodate competitors who may have figured it out. 

The ride-hailing leaders are preparing to bring driverless taxis to your door with new app features that allow customers to use their phones to open trunks and honk horns. They are building infrastructure to maintain the high-tech taxis and training human support staff to handle riders without drivers. 

Both companies will have driverless cars—from Alphabet’s Waymo and others—on their apps this year. In the coming months, riders in Austin, Texas, and Atlanta will be able to hail a Waymo through the Uber app. Lyft plans to offer May Mobility’s driverless taxis in Atlanta.”

From Wall Street Journal.