Pardon my ignorance, but what are Diamond Lanes?
Aka HOV or carpool lanes, they are lanes set aside in certain congested stretches of freeway whereby someone with multiple occupants in a vehicle (in some areas you also need a permit) can zip along in their own private lane while the peasant class sweat amongst the 18-wheelers and Winnebagos.
The excuse was to promote carpooling so less vehicles would be using getting folks to and from work but it often becomes just another way for certain people to live the Clinton dream of living a privileged lifestyle at the expense of the "little people".
Diamond Lanes in California are restricted to vehicles with a minimum of two occupants.
The Diamond Lane is always the left-most lane and during weekdays, when most cars are single occupant, they are the fast lanes. It is not unusual to see speeds of 80 to 90 miles an hour in the Diamond Lanes on LA Freeways when the traffic flow in non-Diamond Lanes is stop and go. The problem is that frustrated drivers occasionally try to enter the Diamond Lanes when they are at or near a dead stop in the adjacent lane. They jump out into the Diamond Lane traffic and don't see or misjudge the speed of the approaching vehicle and WHAMMO - three dead bodies. Happens all the time.