• SOV - single-lane ramp meter, termed Single Occupant Vehicle

• SOV/HOV - dual-lane ramp meter including High-Occupant Vehicle priority treatment

• 2 SOV - dual-lane ramp meter with no high-occupant vehicle priority treatment

• 2 SOV/HOV - three-lane ramp meter including high-occupant priority treatment

• System to System Ramp Meters - a special classification of ramp meter requiring additional considerations due to the unique nature of freeway system interchanges

 

Single-Lane (SOV) Ramps A single lane ramp meter is used at locations where the peak hour design year volume is 720 vehicles or less (1 vehicle every 5 seconds), provided that the existing ramp geometries are capable of providing the required acceleration and storage. SOV ramp meters are typically found in areas where the peak hour demand is low and an HOV lane is not justified or feasible

Metered Two-Lane (SOV/HOV) Ramps Similar to a single-lane ramp meter, a single-occupant / high-occupant combination dual-lane ramp meter should be provided for peak period ramp volumes up to 720 vehicles per hour (1 vehicle every 5 seconds). A high-occupant vehicle priority lane is added to encourage carpool and transit riders when the ramp is nearby a specific large employment base or trip generator (i.e., major factory, shopping mall, etc.). An HOV lane addition is warranted when ramps consist of high occupant vehicles (HOV) totaling 9% or greater of the total peak hour volume.

Metered Two-Lane (2 SOV) Ramps Dual lane (2 SOV) ramp meters are typically found in areas where the peak hour demand is moderate to high and an HOV lane is not justified or feasible. This type of ramp meter is typically used where ramp volumes exceed 720 vehicles per hour.

Metered Three-Lane (2 SOV/HOV) Ramps A three-lane ramp may be designed when two single occupant vehicle lanes (720 vph peak hour or greater in the design year) and an HOV lane are required. Three lane ramps should be considered only under the most favorable conditions, such that the ramp will be on tangent or a large radius curve approaching the ramp stop bar. An HOV lane addition is warranted when ramps consist of high occupant vehicles (HOV) totaling 9% or greater of the total peak hour volume. A three-lane loop ramp typically is not recommended due to safety considerations.

Metered Freeway Connector Ramps Freeway connector ramps are used on freeway spurs or on low-volume freeway segments where it is more advantageous to meter one location onto a major through-route, rather than multiple low-volume surface-street ramps upstream of the system connector ramp. In design of freeway connector ramp meters, high-occupant vehicle lanes are typically avoided due to geometric constraints (such as structures), ramp volume considerations, or right-of-way constraints. However, HOV treatment on freeway connector ramps is not prohibited.

 

https://en.wikipedia.org/wiki/Ramp_meter#Types

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