How to evaluate the effect of a road safety billboard?

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Andrew Douglas

You really need to conduct before and after studies of sufficient number of locations to have statistical significance. And/ or have a control group of roads without such signage. Care will be needed to correct for other factors.

Hossein Shahidzadeh

Hi. Do you have any speed camera or any other device there for speed measuring? It's the best source of data to compare situation before and after using that billboard.

Fengjiao Zou

Before after study, check some of Ezra Hauer or Bhagwant N. Persaud's observational before/after studies in road safety.

Oscar Oviedo-Trespalacios

Observational studies are not enough. You need to understand the issue first. Check our paper: Article The impact of road advertising signs on driver behaviour and...