In one sentence, describe what the following article is about:

To keep your vehicle moving smoothly, be sure to slow down well ahead of any speed bumps, turns, or stoplights that you approach. Engage the clutch to put the gear shift into the neutral position if you need to slow down to the point where you need to put the engine in a lower gear. Pay attention to road signs that will tell you when a speed bump or turn is coming up. If you’re in traffic that’s traveling at speeds up to about 10 miles (16 km) per hour, keep the engine in first gear so you can move forward steadily. The vehicle won’t move forward if it’s in the neutral gear.  Shift the vehicle into second gear when the traffic gets up to about 15 miles (24 km) per hour. Be sure to keep at least 1 car length in front of you in case you need to stop suddenly. If you’re moving too slow in 1st gear, the engine could stall. Engage the clutch, shift the gear shift into neutral, and release the clutch to keep the engine in neutral. Let the vehicle roll and use your breaks to slow it down or stop if you need to. Don’t put the engine into the neutral gear then coast while using your breaks to slow down or you could cause the vehicle to jerk or the gears to grind. Instead, shift back down through the successive gears until you’re in the gear that’s best suited to maintain the speed that traffic is moving in. Don’t skip gears. For instance, don’t shift from 4th gear straight to 2nd or it can cause the gears to grind and the vehicle to shake uncomfortably.

Summary:
Slow down ahead of speed bumps and turns. Keep the vehicle in 1st gear in slow-moving traffic. Put the gear shift in the neutral position when traffic stops or slows to a crawl. Downshift while using the breaks to slow down from a higher gear.