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What's the Difference Between a Street and a Road?

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Reader Brit asks: "Is there any rhyme or reason to calling a road an avenue, a boulevard, a street or a lane? Is it just at the discretion of whoever names the street?"

Although both terms are often applied to the same thing, a road is different from a street, at least in theory. Looking at the definitions that folks like city planners use and the history of the usage of the words, the difference is a matter of place and purpose.

Roads run between two distant points — two towns, for example. In each of those towns, you'll find streets: paved roads lined with houses and other buildings. It used to be the paving and the buildings that made a street a street, but today you'll find many paved roads that have buildings on them (I grew up on Wisteria Road). Modern sticklers for usage will tell you that what sets streets apart today is the street life that comes with them. On Main Street in a given town, you might find people walking their dogs, having lunch in a sidewalk cafe, waiting for a friend on the corner, or simply people watching. On the road connecting Town A to Town B, you're not likely to find any of this.

The term street, then, should be specifically applied to urban roadways. Streets connect people for interaction, while roads connect towns and cities for travel.

In the real world, though, these textbook distinctions aren't always made.

As cities grow, roads can become urbanized and serve the purposes of streets without having their names changed. Some cities and towns may be planned with naming systems that designate roadways one thing or another without regard to their function. Other roadways serve different purposes along different parts of their length and get different designations accordingly. Pennsylvania Route 611 is a major state highway that runs from South Philadelphia north to Coolbaugh Township in the Poconos. Within Philadelphia, 611 is Broad Street, where you'll find homes, businesses, street life and, on New Year's Day, Mummers urinating everywhere. At the northern end of Philadelphia, PA 611 leaves Broad Street and becomes Old York Road, a historic road that connected Philadelphia to New York City. As it continues north, it also becomes Easton Road, Delaware Drive, and Fox Town Hill Road along certain stretches.

Other Places on the Map

Street sign via Shutterstock

Now that we've hashed out roads and streets, what about the alleys, avenues, boulevards, circles, courts, drives, expressways, highways, lanes, parkways, paths, places, squares, terraces, trails, ways and other roadway name suffixes we use? Here are some select definitions (that aren't always followed):

An avenue is traditionally a straight road with a line of trees or shrubs running along each side, which emphasize arrival at a landscape or architectural feature.
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A boulevard is usually a widened, multi-lane arterial street with a median and landscaping between the curbs and sidewalks on either side.
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A court is a short street that ends as a cul de sac.
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A drive can be short for driveway, a private road for local access to one, or a small group of structures. Other times it refers to meandering, rather than straight, roads and highways.
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An expressway is a divided highway meant for high-speed traffic.
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A freeway is a road designed for safe high-speed traffic through the elimination of intersections at the same grade or level.
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A highway is a main road intended for travel between destinations like cities and towns.
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A lane is a narrow road or street usually lacking a shoulder or a median.
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A way is a minor street off a road in a town.

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Big Questions
Where Is the Hottest Place on Earth?
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The summer of 2017 will go down as an endurance test of sorts for the people of Phoenix, Arizona. The National Weather Service issued an extreme heat warning, and planes were grounded as a result of temperatures exceeding 120 degrees. (Heat affects air density, which in turn affects a plane’s lift.)

Despite those dire measures, Phoenix is not the hottest place on Earth. And it’s not even close.

That dubious honor was bestowed on the Lut Desert in Iran in 2005, when land temperatures were recorded at a staggering 159.3 degrees Fahrenheit. The remote area was off the grid—literally—for many years until satellites began to measure temperatures in areas that were either not well trafficked on foot or not measured with the proper instruments. Lut also measured record temperatures in 2004, 2006, 2007, and 2009.

Before satellites registered Lut as a contender, one of the hottest areas on Earth was thought to be El Azizia, Libya, where a 1922 measurement of 136 degrees stood as a record for decades. (Winds blowing from the nearby Sahara Desert contributed to the oppressive heat.)

While the World Meteorological Organization (WMO) acknowledged this reading as the hottest on record for years, they later declared that instrumentation problems and other concerns led to new doubts about the accuracy.

Naturally, declaring the hottest place on Earth might be about more than just a single isolated reading. If it’s consistency we’re after, then the appropriately-named Death Valley in California, where temperatures are consistently 90 degrees or above for roughly half the year and at least 100 degrees for 140 days annually, has to be a contender. A blistering temperature of 134 degrees was recorded there in 1913.

Both Death Valley and Libya were measured using air temperature readings, while Lut was taken from a land reading, making all three pretty valid contenders. These are not urban areas, and paving the hottest place on Earth with sidewalks would be a very, very bad idea. Temperatures as low as 95 degrees can cause blacktop and pavement to reach skin-scorching temperatures of 141 degrees.

There are always additional factors to consider beyond a temperature number, however. In 2015, Bandar Mahshahr in Iran recorded temperatures of 115 degrees but a heat index—what it feels like outside when accounting for significant humidity—of an astounding 163 degrees. That thought might be one of the few things able to cool Phoenix residents off.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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Big Questions
How Does Autopilot Work on an Airplane?
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How does autopilot work on an airplane?

Joe Shelton:

David Micklewhyte’s answer is a good one. There are essentially a few types of features that different autopilots have. Some autopilots only have some of these features, while the more powerful autopilots do it all.

  • Heading Hold: There’s a small indicator that the pilot can set on the desired heading and the airplane will fly that heading. This feature doesn’t take the need for wind correction to desired routing into account; that’s left to the pilot.
  • Heading and Navigation: In addition to holding a heading, this version will take an electronic navigation input (e.g. GPS or VOR) and will follow (fly) that navigation reference. It’s sort of like an automated car in that it follows the navigator’s input and the pilot monitors.
  • Altitude Hold: Again, in addition to the above, a desired altitude can be set and the aircraft will fly at that altitude. Some autopilots have the capability for the pilot to select a desired altitude and a climb or descent rate and the aircraft will automatically climb or descend to that altitude and then hold the altitude.
  • Instrument Approaches: Autopilots with this capability will fly preprogrammed instrument approaches to the point where the pilot either takes control and lands or has the autopilot execute a missed approach.

The autopilot is a powerful computer that takes input from either the pilot or a navigation device and essentially does what it is told to do. GPS navigators, for example, can have a full flight plan entered from departure to destination, and the autopilot will follow the navigator’s guidance.

These are the majority of the controls on the autopilot installed in my airplane:

HDG Knob = Heading knob (Used to set the desired heading)

AP = Autopilot (Pressing this turns the autopilot on)

FD = Flight Director (A form of navigational display that the pilot uses)

HDG = Heading (Tells the autopilot to fly the heading set by the Heading Knob)

NAV = Tells the autopilot to follow the input from the selected navigator

APR = Tells the autopilot to fly the chosen approach

ALT = Tells the autopilot to manage the altitude, controlled by the following:

VS = Vertical Speed (Tells the autopilot to climb or descend at the chosen rate)

Nose UP / Nose DN = Sets the climb/descent rate in feet per minute

FLC = Flight Level Change (An easy manual way to set the autopilot)

ALT Knob = Used to enter the desired altitude

This post originally appeared on Quora. Click here to view.

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