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When you are not able to stop safely for any instance that may occur. There should never be a point of no return when driving a vehicle.
The first thing you want to know about driving is how to drive safely. You should learn about the different ways to avoid accidents.
you should safely change to the right lane
Slow down until you can safely follow the equipment (if it's traveling the same direction you are), then carefully wait till there is a clear opportunity to safely pass. If the equipment is traveling in the opposite direction, slow down until you can be sure how much clearance space you may need to allow it to get by you. The main thing to remember is --SLOW DOWN !!!
Stop and pull over as quickly and safely as you can
Driver use gear 'L' or '2' when driving uphill or downhill which required higher gear ratio to move the uphill. Downhill wise, driver use '2' or 'L' for safety purpose. The low gear ratio will use the high gear ratio to slow down the speed of driving downhill and creating 'pulling' force on your car to safety purposes. Gear '2' can be use for overtaking on the highway too provided at the appropriate speed.
merge left when possible so that othe vehicles may enter safely
Slow down from your normal speed. Be prepared to stop safely in emergencies.
You should leave enough time to allow you to stop safely if the car in front comes to a sudden halt. You should be aware of your vehicles stopping capabilities and adjust the driving time accordingly.
You can only travel within the posted speed limits and the overtaking procedure must be attempted only if you believe it can be done safely.
If you are traveling in a vehicle with young passengers, they need to be in carseats if they are young and all children should be in a seatbelt. If you are driving a bus, you should make sure they have a caregiver traveling with them.
You should look into a driver's education class, or enroll yourself in a driving school. Most schools, give you the option to enroll for a semester of driver's education where you will be tested and trained to drive safely.