A rough general rule for required tire pressure is given by the manufacturer in their catalog.

I have long had a rough rule of thumb based on my perceptions over the last 40 years or so.

Of course, there are exceptions to these rough rules.

A very rough rule of thumb to significance is that values greater than +2 or less than -2 are likely to be significant.

And with this disclaimer in mind, it's easy to make some rough and ready rules.

The most pragmatic species and jobs, as a rough rule.

As a rough rule, it seems that writers fall into two camps.

They were just simple folk with rough rules of honor and justice.

They were a tough people with rough rules of honor and chivalry.

Taking that figure as a rough rule of thumb, securing Iraq, which has 25 million people, would require 500,000 foreign troops.