What's the significance of 142 yards in country driving?

Question

I keep seing give way warning signs at 142 yards on country roads - Ihave tried to rationalise this number of yards against stopping distances, braking distances, metric conversions, imperial factors and nothing seems to make any sense. Anyone know why it is more often than not 142 yards?

Answer 1

Give way signs are mostly used in wales,and the 142 is for long and over sized loads.

Answer 2

Try this site or just your local agency.............

http://www.dot.gov/