Road lighting with HB

Hi to all,
I am running a series of lighting simulations integrated with daylight for a tunnel and I was wondering if there is any method to actually measure luminance in cd/sqm with Honeybee in a grid of points representing the observers point of view. I know this can ve done with the HDR fisheye image simulation, I have done this in the past for assessing glare and contrast. In this case I am more interested in assessing only specific points in relation to the road. I know the grid based component from HB can calculate luminance in cd, so I assume it’s considering everything in a hemisphere in the vector direction, but I am only interested in a specific point cd/sqm on the road and not the whole hemisphere. Has anybody tried this before? Could you please give me a hint on how to measure this?