| Letter | Connector road |
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| a | Off ramp from Right roadway to local road network |
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| b | On ramp from local road network onto Right roadway |
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| c | Off ramp from Left roadway to local road network |
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| d | On ramp from local road network onto Left roadway |
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| e | Direct (right) turning connecting curve from Right roadway on lowest numbered highway to the highest numbered highway |
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| f | Direct (right) turning connecting curve from Left roadway on lowest numbered highway to the highest numbered highway |
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| g | Semi-direct (left) turning connecting curve from Right roadway on lowest numbered highway to the highest numbered highway |
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| h | Semi-direct (left) turning connecting curve from Right roadway on lowest numbered highway to the highest numbered highway |
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| j | Indirect (cloverleaf style) right turning connecting curve from Right roadway on lowest numbered highway to the highest numbered highway |
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| k | Indirect (cloverleaf style) right turning connecting curve from Left roadway on lowest numbered highway to the highest numbered highway |
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| m | Parallel roadway on the lowest numbered highway with traffic moving in the direction of increasing distance posts |
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| n | Parallel roadway on the lowest numbered highway with traffic moving in the direction of decreasing distance posts |
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| p | Short-circuit connector between two connector roads or in a rest area with traffic moving in the direction of increasing distance posts |
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| q | Short-circuit connector between two connector roads or in a rest area with traffic moving in the direction of decreasing distance posts |
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| r | Direct (right) turning connecting curve from Right roadway on highest numbered highway to the lowest numbered highway |
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| s | Direct (right) turning connecting curve from Left roadway on highest numbered highway to the lowest numbered highway |
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| t | Semi-direct (left) turning connecting curve from Right roadway on highest numbered highway to the lowest numbered highway |
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| u | Semi-direct (left) turning connecting curve from Left roadway on highest numbered highway to the lowest numbered highway |
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| v | Indirect (left) turning connecting curve from Right roadway on highest numbered highway to the lowest numbered numbered highway |
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| w | Indirect (cloverleaf style) right turning connecting curve from Left roadway on highest numbered highway to the lowest numbered highway |
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| x | Parallel roadway on the highest numbered highway with traffic moving in the direction of increasing distance posts |
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| y | Parallel roadway on the highestnumbered highway with traffic moving in the direction of decreasing distance posts |
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