Consider two cars are approaching each other as shown above, To avoid any head-on collision, SSD=SD1+SD2 For car A : f=0.35,tr=2.5,VA=25m∕s ∴SSD1=VA.tr+
(VA)2
2‌gf
⇒SSD1=25×2.5+
252
2×10×0.35
=151.78m For car B : VB=20m∕s , f=0.35,tr=2.5 ∴SSD2=VB.tr+
(VB)2
2‌gf
=20×2.5+
(20)2
2×10×0.35
=107.14m ∴ Total sight distance =SSD1+SSD2=151.78+107.14=258.92m