The new service, expected to be live in mid-May, essentially eliminates the hassle of ordering a Lyft ride and then having to hunt through a weaving line of cars for the right car and driver. With this feature, users order a ride and are immediately issued a 4-digit code. The user then gets into a line at the airport — much like the taxi lines — and awaits their turn for a ride. Once the user reaches the front of the line, he or she shows the code to the next driver. The driver then punches in the code, which links driver and passenger in Lyft’s system.