If it has not rained recently by extremely cautious of slick roads and low traction for the first how many minutes after begins to rain?

If it has not rained recently, be extremely cautious of slick roads and low traction for the first 15 to 30 minutes after it begins to rain. During this time, oil and debris on the road surface can mix with the rainwater, creating dangerous conditions. After this initial period, the road may improve as the rain washes away the slippery substances. Always drive carefully and adjust your speed accordingly in wet conditions.