They are very impact driven it seems and offers a unique was of advertising, it seems that traditional advertising through the use of flyers, billboards, are damaging the environment and not as effective as what they used to be. Also with static content it’s hard to measure the ROI and also their are only a few suitable places for each, this method it seems can be put anywhere.

I’ve found another company which specialises in this and covers the whole of the UK (mentions how they will go abroad too!) http://www.dirtystreetadvertising.com – i think the name says it all. A good collection of work to date.

I think that ultimately almost all advertising (with the exception of online) is hard to measure. That’s part of the attractiveness of internet marketing. However, that doesn’t mean a company can’t get a little creative. For example, I did see that Curb did some street logos with URLs. Maybe this is one way to get a sense of return.

Or, perhaps another way is to use a phone number with call tracking. Then, if you paid for a Curb ad and see how many people follow-up.

I think at the end of the day, any type of brand investment is going to be hard to return. But, with a few creative ideas, I think you could get closer to measuring ROI from one of these ads.