Why does my 2010 impala front driver side turn signal is on but doesn't flash why?
Flasher relay is defective. Replace it. Can also be both front and rear bulbs are burnt out.
If you are refering to the turn signal flasher, you have to remove the driver side lower dash panel. It is not hard to do, the flasher is located on the back of the fuse box. I have not tried to get to it without removing the panel, but it may be possible. There is also a retainign clip on the flasher that you have to remove to get the flasher out.
Trucks generally flash their lights quickly just before passing to warn the car driver that they are coming around in case the driver is not concentrating. It is a courtesy in my opinion and the driver being passed should maybe move over a little and maybe even slow down to speed up the process. Once the vehicle is passed the truck driver will often flash each blinker quickly to acknowledge the other driver
What causes the turn signal on the left to stay lit and not flash in the front and back on a 1997 Chevy Camaro?
This isn't a rule of thumb about distance, it's about how long you signal your intention (time). I don't know the set law about this time. My dad is a professional truck driver with 30 years over the road, he told me, when I was learning to drive, when you turn your turn signal on to switch lanes, let it flash for 2 or 3 times before you begin changing lane.