button at highway service station, from Gunma to Nagao

What is the button for ?
http://saywhatjapan.com/translate-japanese/street-driving/button-at-highway-service-station-from-gunma-to-nagao/2018/05/https://i0.wp.com/saywhatjapan.com/wp-content/uploads/2018/05/DSC_0997-768x432.jpg?fit=768%2C432https://i0.wp.com/saywhatjapan.com/wp-content/uploads/2018/05/DSC_0997-768x432.jpg?resize=150%2C150STREET, DRIVINGbutton,Gunma,highway,Nagao,service stationWhat is the button for ?TS stmmy12o17@gmail.comAdministratorSAY WHAT !?, JAPAN ! - translate "THE" Japanese in towns
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