First, the world's smallest caravan. Now, the loudest ever bike horn?

The Environmental Transport Association is on a mission to make a point of a few things that affect road users - and has just unveiled the world's loudest bike horn as its latest achievement.

Before looking at that, however, it also produced an interesting creation just last year when it unveiled the £5,500 QTvan - the world's smallest caravan - which was developed to highlight the estimated 220,000 people who use mobility scooters without breakdown cover. Of course, this leads to the prospect of being stranded - and this creation was directed at potential caravan insurance customers who wanted something small enough to tow into a supermarket.

At the time, the ETA's Yannick Read said that their only options are "to push something that weighs the equivalent of two men all the way home or call on a relative with a large car".

Now, Mr Read has developed the Hornster bicycle, which emits a 178 decibels noise - one so loud that it could deafen any motorist who came too close. He wanted to highlight the issues faced by cyclists on city roads; trucks, he explained, are involved in more than half of cyclist deaths in London alone.

He said: "The same quietness that makes bicycles such a civilised way of getting around makes them vulnerable to inattentive motorists - the Hornster is a wake-up call for drivers who don't pay attention to bikes."