If then, a bicycle is keeping to the right side of the right lane, how does a bicycle make a left turn at an intersection, especially when on a road with multiple lanes in each direction?  There are two ways to approach this, depending on the traffic.  If the traffic is moving slowly enough or stopped, or if there is enough room between cars, then bicyclists simply do exactly what cars do.  Signal a left turn (with your hand signal), check your blind spot, and ease across traffic to the lane you need to be in to make a left turn.  If this is unsafe due to too much traffic moving too quickly, then the other option to make a left turn is to stay on the right side of the right lane, cross the street that you intend to “turn left” on, then once you are at the other side, make a sharp 90-degree turn to your left and bam! you are on the right side of the road you intended to turn on.

One of the finer points of making left turns while road biking is to understand the “switches” that operate stoplights at many intersections.  Imagine you are at a stoplight, on your bike, having crossed over to a left turn lane, and the light just does not seem to turn green.  The reason for this is that the light is programmed to stay red for you and green for the crossing traffic unless a magnetic sensor right underneath you in the left turn lane detects a “car” is waiting for the light to turn.  Because you don’t have the metal undercarriage of a car sitting right over the sensor, the light will never turn for you.  The solution is to partially dismount your bike and lay your bike down almost touching the road, right over the sensor which is imprinted into the road in the left turn lane, usually looking like a circle inside of a square.