1. when changing lanes,

turn off the radio.
make sure you are not on a one-way street.
it is not necessary to signal.
speed up or slow down as necessary.

2. you should signal for a right or left turn

500-600 feet in advance.
7-8 feet in advance.
as you are making the turn.
at least 150-200 feet in advance.

3. to parallel park, move your vehicle parallel to the vehicle in front of the space, at a distance of

less than 1 foot.
1 to 2 feet.
about 3 feet.
about 5 feet.