When rain begins, which period is most dangerous due to road conditions?

• A. The first 10-15 minutes after rain begins
• B. The middle of the rain storm
• C. After the rain ends
• D. The entire time

Answer: (A)

When rain first starts, the road becomes slickest because oil, grime, and rubber residues mix with the new water, creating a thin film that dramatically reduces tire grip. Tires need time to displace that film, so stopping distances lengthen quickly and vehicle control is easier to lose. As rain continues, it washes away some of that residue, and traction improves, though the road remains wet and requires cautious driving. After rain ends, standing water and drying patches can still be hazardous, but the initial moment—about the first 10–15 minutes—is when the surface is at its slickest. Drive slowly, increase following distance, and avoid hard braking during that period.