Function to calculate approximate lane offset from carriageway and xsp

calculate_nickmapbi_offset.py

def calculate_nickmapbi_offset(carriageway, xsp):
    return {
        "L":{
            f"L{num+1}": +3.5/2 - 3.5*num for num in range(0,7)
        },
        "R":{
            f"R{num+1}": -3.5/2 + 3.5*num for num in range(0,7)
        },
        "S":{
            f"L{num+1}": -3.5/2 - 3.5*num for num in range(0,7)
        }|{
            f"R{num+1}": +3.5/2 + 3.5*num for num in range(0,7)
        }
    }.get(carriageway,{}).get(xsp,0)

tests = [
    ["L","L1"],
    ["L","L2"],
    ["R","R1"],
    ["R","R2"],
    ["S","L1"],
    ["S","R1"],
]
for [cwy, xsp] in tests:
    print(f"{cwy},{xsp} = {calculate_nickmapbi_offset(cwy,xsp)}")