Sudsy gives wise and comprehensive advice. Follow it or place yourself at considerable risk.
I've even heard co-workers relate that their
passports were confiscated to ensure they met their obligations when involved in accidents.
I've been driving in Japan since 1999 and have not experienced much of anything that would be unusual in the States.
There are circumstances to be aware about. One is parking. If you purchase a vehicle, you must go to the local municipal police department confirming that your residence has sufficient parking spaces for your vehicle/s. I own two cars and the police visited my residence before awarding the certificate. If your residence does not have a parking space, you must show proof that you have rented a space in the neighborhood. I'm not positive about this, but I believe yellow plate vehicles are exempt from this requirement.
Every local area has their own parking regulations and you must be aware of them and comply. For example, we had a new house built, but the driveway was not completed before we moved in. For the three days it was being constructed we parked on a nearby, relatively deserted street. All was OK for the first night, however, the next morning the car had a cable attached with a parking violation. My wife had to go to the local police department to get it removed. She was able to convince the officers to tear up the ticket once we promised to never do so again and to never tell anyone they let us off. We discovered, then, that the local community association had a special parking lot available. We have used that lot when her parents have spent a few days with us.
Once while driving in Tokyo, I was pulled over by a motorcycle officer, like the ones in the picture above. My wife, who serves as the navigator when we go on excursions, told me to turn right on a street. We did not notice the sign that limited such turns except at night. After profusely apologizing, we were let off with a warning.
Be aware, also, that there are certain times of the year when traffic officers are holding special
"campaigns" to catch violators. You must be especially vigilant during those campaigns.
Keep you eyes open and learn the habits of the local police. For example, in my neighborhood, there is a stop sign at the top of our little mountain. One officer will hide behind a hedge to spot those not coming to a complete stop. A block down the road is another officer flagging down those that did not comply. Every time I see them they have plenty of customers.
The same goes for "speed traps," equipped with officers using radar. I have often smugly passed drivers caught in these traps for being so
baka to get caught. Last year, my wife warned me about one near where I work and I dismissed her warning saying I already knew about the spot. When
"karma" (ouch) struck, I was caught and received my first traffic ticket since living in Japan.
It cost me Yen 15,000 to pay the ticket and a
Coach bag in compensation to my wife. Ouch again!!!