Risk of a road accident in rainy weather

Area of Science:

• Road safety
• Environmental science
• Transportation research

Background:

• Assessing the impact of weather on road safety is crucial for accident prevention.
• Previous methods for quantifying rain-related accident risk have limitations.
• Traffic exposure to rain is difficult to measure accurately.

Purpose of the Study:

• To review existing methods for measuring the added risk of road accidents in rainy weather.
• To apply and evaluate two selected methods using data from Israel and the United States.
• To quantify the increased risk of injury accidents during rainfall.

Main Methods:

• Literature review of accident risk assessment methods during adverse weather.
• Application of selected risk assessment models to traffic data from Israel and the US.
• Utilizing surrogate measures for traffic exposure to rain due to data limitations.

Main Results:

• The added risk of an injury accident in rainy conditions is substantial.
• Accident risk during rain is estimated to be two to three times greater than in dry weather.
• Rain following a dry spell presents an even greater hazard.

Conclusions:

• Rainy weather significantly increases the risk of road accidents, particularly injury accidents.
• Current methods for assessing rain-related risks have accuracy limitations.
• Further research is needed to refine risk assessment models for adverse weather conditions.