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Notations | Description | Units |
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| Origin or centre of the roundabout | |
| Angle between two radian points | |
| Angle between two radian points of auxiliary queuing lane | |
| Limited vehicles queue before second stop-line from approach x | m |
| Radius of the roundabout | m |
| No. of possible vehicle’s queue on the approach x | m |
| Average occupied space of a single vehicle | m |
| Left-turning lanes in circulatory roadway for the approach x vehicles | m |
| No. of vehicles | |
| Capacity of circulatory roadway for left-turn vehicles | Pcu/h |
| Weaving width of circulatory roadways | m |
| Entry lane | |
| Exit lane | |
| Signal cycle length | s |
| Total lost time | s |
| Total no. of phases j to k for approach x | s |
| Saturation flow towards circulatory roadway by using phase j | Pcu/h |
| Lost time during signal cycle | s |
| Total lost time of red light during change cycle | s |
| Time to leave vehicle before second stop line (SL) from approach x | s |
| Saturation flow of circulatory roadway | Pcu/h |
| Effective green total time per cycle | s |
| Effective green time for approach 1 | s |
| Effective green time for approach 2 | s |
| Effective green time for approach 3 | s |
| Saturation flow rate of straight-going traffic at approach x | Pcu/h |
| Traffic flow rate of approach x | Pcu/h |
| Green time adjustment of straight-go flow of approach (2, 3) | s |
| Saturation flow rate of straight-go traffic of approach x | Pcu/h |
| Width of one circulatory lane of roundabout | m |
| Green time for straight-go traffic on approach x | s |
| Left-turn vehicle ratio from approach x | Pcu/h |
| Saturation flow rate for left-turn vehicles on approach x | Pcu/h |
| Limited no. of lanes for left-turn vehicles | |
| Saturation flow of left-turn lane on approach x | Pcu/h |
| Green time for left-turn flow before second stop line | s |
| Changing interval between and | s |
| Capacity of one approach direction | Pcu/h |
| Total capacity of TLSR-2SL | Pcu/h |
| Capacity of first stop-line from approach x | Pcu/h |
| Capacity of second SL from approach x | Pcu/h |
| No. of straight-going lanes at first SL on approach x | |
| Green time for first SL vehicles at approach x | s |
| Capacity of left-turn vehicles on approach x at first stop-line | Pcu/h |
| Green time of left-turn vehicles at first SL on approach x | s |
| No. of left-turn lanes at first SL on approach x | |
| Left-turn flow inside circulatory from approach x | Pcu/h |
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