What does this traffic sign indicate?

This traffic sign indicates a natural gas fuel station, specifically for compressed natural gas (CNG). In Germany, these signs guide drivers to specialized refueling points for alternative fuels. The "CNG" abbreviation stands for compressed natural gas, a cleaner fuel option compared to traditional petrol or diesel.

Knowing this sign helps drivers of CNG vehicles locate appropriate filling stations. It is important because not all fuel stations offer CNG, so this sign prevents confusion and ensures that vehicles using natural gas can refuel safely and conveniently.

In summary, this sign is a service sign showing the availability of natural gas filling stations, important for drivers using environmentally friendly fuel types.