A kind of aggregate · also called Aggregate base course, Crushed rock base, Road base gravel
About
Road base is the dense aggregate mix used under pavements and emergency runways, weighing about 14.2 ounces (402 grams) per cup.
With a typical bulk density of 106 pounds per cubic foot (1.7 g/mL), road base is a dense mixture of crushed stone and mineral filler. It is laid and compacted to form sturdy foundations beneath roadways, highway strips, and auxiliary aircraft runways. Because it packs tightly with minimal air space, it is heavier than loose sand or garden soil. A single cubic yard (0.76 cubic meters) of the material weighs roughly 2,860 pounds (1,300 kg).
From Wikipedia
A road runway or road base or highway airstrip (US), is a section of an automotive public road, highway, motorway, or similar, that is specially built to act as a runway for (primarily) military aircraft, and to serve as an emergency or auxiliary military airbase. These road runways allow military aircraft to continue operating even if the runway at their respective airbases are degraded, damaged, or destroyed.
Read more on Wikipedia →Text from Wikipedia’s “Road runway” article, CC BY-SA 4.0.
One cup weighs
14.2 oz (402 g)
Quick answer
One US cup of road base weighs about 14.2 ounces (402 g). That makes it roughly 1.7 times heavier than an equal volume of water, feeling similar in hand to packed gravel.
Typical figures, the same ones every comparison on the site uses; real ones vary.
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Next to anything: a person, a car, another aggregate.