At first look, with the red colored heading, it appears like a warning sign.  However, it is a welcome sign with information to the visitors that they are entering the Kuwait Free Trade Zone (KFTZ) area.

Funnels?

The Funnel like structures are water tanks.  There are present in few select areas, said to be unique to Kuwait.  That is probably the reason why we have miniature of these in front of some Kuwaiti villas.

There are totally twenty four such funnel type tanks located in three places in Kuwait .  One of three locations is Bayan (in the picture) near the Bayan Palace (nine tanks), second one is South Sura (six) and the last one is in Al-Ardiya (nine).

Kuwait Water Towers

Kuwait Water Towers are a set of three structures that have almost become a symbol of Kuwait. 
As per Wikipedia the main tower is 187 metres high and serves as a restaurant and water tower. 

I visited this tower during May 2010 with my family (after almost three years of living in Kuwait).  The main tower also has a viewing sphere which rises to 123 meters above sea level and completes a full turn every 30 minutes, I learn from Wikipedia. The second tower is 145.8 metres high and serves as a water tower. The third tower houses equipment to control the flow of electricity and illuminates the two larger towers. The towers hold 4,500 cubic meters of water.

The towers were designed by Sune Lindström and Malene Björn and built by Energoprojekt, a company from Belgrade, Yugoslavia. They opened to the public in March 1979.