biomechanical properties of the cornea, a wide-angle observation system for vitreous body surgery, universal trial goggles for subjective refraction, various perimeters for visual field testing and vision testing devices for testing eyesight. Electrical transformers are produced by Hitachi ABB Power Grids in Hanau and Siemens Energy in Frankfurt-am-Main. SMA Solar Technology manufactures an inverters for photovoltaic systems. Rittal is specialized on electrical enclosure situated in Herborn and Eschenburg. Power semiconductors from IXYS in Lampertheim and UV and infrared lamps from Heraeus. IT & Telecom Many IT and telecommunications companies are located in Hesse, many of them in Frankfurt and Darmstadt, like Software AG (Darmstadt), T-Systems (Frankfurt and Darmstadt), Deutsche Telekom (laboratories in Darmstadt), DB Systel (Frankfurt), Lufthansa Systems (Raunheim near Frankfurt) and DE-CIX (Frankfurt). Food & Beverage Sweet making is typical, there are 2 big factories: Ferrero, Stadtallendorf and Baronie (Sarotti), Hattersheim am Main. Frankfurter Sausage is famous, but there is also other sorts like Frankfurter Rindswurst, Ahle Wurst. Beverage industry is well-developed and manufactures sparkling wine (Sekt), white wine (Riesling), mineral waters (Selters), beers (Radeberger) and cider. In Frankfurt-Oberrad exists growing of wild herbs for green sauce and monument. Defunct Industries The leather industry was predominantly based in Offenbach, but is now extinct, existing only in museums. The same happened with Frankfurt's fur industry and Hanau's jewelry industry. Typical Hesse's Products Unemployment The Hochtaunuskreis has the lowest unemployment rate at 3.8% while the independent city of Kassel has the highest rate nationally at 12.1%. In October 2018 the unemployment rate stood at 4.4% and was lower than the national average. Traffic and public transportation Road transport Hesse has a dense highway network with a total of 24 motorways. The internationally important motorway routes through Hesse are the A3, A5, and A7. Close to Frankfurt Airport is the Frankfurter Kreuz, Germany's busiest and one of Europe's busiest motorway junctions, where the motorways A3 (Arnhem-Cologne-Frankfurt-Nuremberg-Passau) and A5 (Hattenbach-Frankfurt-Karlsruhe-Basel) intersect. The A5 becomes as wide as four lanes in each direction near the city of Frankfurt am Main, and during the rush-hour, it is possible to use the emergency lanes on the A3 and A5 motorway in the Rhine-Main Region, adding additional lanes. Other major leading Hesse highways are the A4, the A44, the A45, the Federal Highway A66 and the A67. There are also a number of smaller motorways and major trunk roads, some of which are dual carriageways. Railway transport