The ruling minimum radius of horizontal curve of a national

The ruling minimum radius of horizontal curve of a national highway in pljain terrain for a design speed of 100 km/hour with e = 0.07 and f = 0.15 is close to

Design speed = 100 kmph

= 100 ×	5	m/s = 28 m /s
	18

e + f =	v²
	gR

0.07 + 0.15 =	28²
	9.8 × R

∴ R ≈ 360 m