What are the precautions for traveling in America? What should I pay attention to when traveling to America?

Traffic rules 1) The car is driving on the right road. All states require the use of seat belts and child safety seats. In most car rental companies, you can rent a child safety seat at a price of around 12 yuan per day, but you must declare at the time of booking that in some states, you must wear a helmet when riding a motorcycle. 2) On the interstate expressway, the speed limit is 75 miles per hour. Unless otherwise specified, the speed limit is generally 55 or 65 miles in expressway, 25 or 35 miles in cities and towns, and as low as 65,438+05 miles in school districts (during school hours, it is forbidden to drive more than 65,438+05 miles). When the school bus light flashes, overtaking is prohibited. 3) Most states have laws against littering in expressway (and impose huge fines). Nowadays, in more and more states, it is illegal to talk on a mobile phone while driving, but it is legal to use hands-free devices. 4) When the alcohol concentration in the blood is lower than 0.08%, the driver can drive. If it exceeds the standard, the punishment for "DUI" (driving under the influence of alcohol and/or drugs) is very severe. The police can check and evaluate roadside drivers to confirm whether you are driving under the influence of alcohol and/or drugs. If you can't pass the test, they will ask you to take a breath test, urine test or blood test to determine the alcohol or drug content in your body. If you refuse to take the test, it will be considered a failure. In some states, it is illegal to drive with an open bottle, even if it is empty. Tips are usually given unless you think the service you receive is extremely bad. 1. The tip for airport and hotel porters is $2 per bag, and not less than $5 per car. 2. The bartender's tip accounts for 65,438+00% to 65,438+05% of each consumption, and each bottle of wine is not less than 65,438+0 USD. The hotel maid's tip is 2 to 4 dollars per night, which can be put under the card provided. 4. The waiter's tip accounts for 15%-20% of the meal fee, unless the tip has been received in advance on the bill. 5. The taxi driver's tip is 10% to 15% of the fare, rounded off. When he returns the key, the parking attendant should tip him at least 2 dollars. Mobile phone and calling card mobile phone: If your mobile phone is not compatible, you can also buy a cheap contract-free (prepaid) mobile phone, which comes with a local number and a set number of talk time, and can be renewed as needed. Mobile phones sold by VirginMobile, T-Mobile, AT & ampt and other suppliers start at $65,438+05, and 400 minutes of talk time starts at $40. There is no cell phone signal in large areas of rural America, including many national parks and entertainment places. Please check the coverage of your mobile phone provider. Calling card: For budget-conscious tourists, prepaid calling cards are a good choice. Read the fine print on the card carefully, because many cards have added hidden fees such as "activation fee" or "connection fee" in addition to the basic rate. The standard voltage of power supply voltage is 1 10V. If you need to use non-American electronic equipment, please prepare an adapter. Network environment There are not many Internet cafes in America. If you bring your own computer, Starbucks and other coffee shops have wireless networks. Most hotels also offer free Wi-Fi. In addition, mobile phone stores such as Apple Store have free wireless network, which is very fast. If you surf the Internet frequently, it is recommended to bring portable wifi devices from the United States, so you can surf the Internet freely anytime and anywhere in the United States.