[Obi_Juan_Kenobi]

> LIDAR cannot see though fog

Simply depends on what wavelength of light you use.

Water-absorbing frequencies are nice because the atmosphere then shields most light, giving you nice SNR from your laser illumination. But better sensors could work around this, using other frequencies that can 'see' through fog.

It's certainly a technological limitation of current systems, but it's not an inherent limitation.