Effective types of outdoor advertising include billboards, train interior/platform ads and street furniture. Each type has different benefits depending on your location and target audience. 

Yes, outdoor advertising can complement digital and traditional marketing efforts. For example, a billboard might drive customers to your website or social media, where they can find more detailed information or promotions.

This depends on your campaign goals. Some ads can be seasonal, while others might promote a long-term brand message. Changing ads periodically can keep your messaging fresh and engage repeat viewers.