Joint Impact of Rain and Incidents on Traffic Stream Speeds

Table 3

Reduction in traffic stream speed due to precipitation and incidents in the free-flow regime and only due to incidents in the congested regime.

Incident severity	Precipitation level	Reduction in traffic speed (%)
		Free-flow regime	Congested regime
No Incident	Light	0.0	0
	Heavy	0.0–0.4
Low	No rain	0.0	41–57
	Light	0.0–0.5
	Heavy	0.6–6.5
High	No rain	0.0	58–75
	Light	0.6–4.0
	Heavy	6.5–10.0