1. Set consumption restrictions on credit cards: Banks sometimes set consumption restrictions on credit card users, such as spending only at designated merchants, designated shopping platforms or designated areas. If your credit card is set with ETC spending restrictions, you can only spend it at ETC toll station, and you can't use it anywhere else.

2. There is something wrong with the credit card: Sometimes there may be something wrong with the credit card, such as the card reader can't read the card information, the card chip is damaged or the account is frozen. If there is something wrong with your credit card, you may not be able to spend it elsewhere, but only at the ETC toll station.