Terron Microsystems supplies Fog signal Post Detonators. Terron Microsystems offers GSM, GPS and microprocessor / microcontroller based systems. Fog signal Post Detonators is a compact battery backed Device that orients the driver about his location on a track section by only using GPS signals. Fog signal Post Detonators pre-alerts the driver about the arrival of various using non-obtrusive audio-visual alerts using the section data stored on the unit. If used extensively it will eliminate LC gate accidents during fog and save railways millions in detonator and "khallasi" costs during fog.