called exlite.mer investigation reporter has the action being taken by transportationof cials. >> reporter: no other family has to be fere. st introduced you to steve last fall. aus 17 year-oldter was killed after crashing into an exlite in tennessee. in 2016. >> guardrail pierced her car. and she was killed instantly. >> reporter: he learned his daughter was not the only one to die this way. for the last year and a half he has met with state and federal officials. all over the country. pushing to have the guardrails usmoved. >> i never thought i would be going through this. ever in my life. >> reporter: earer this year, this who are joined his fight. sandra carter's son michael died ter hitting an exlite on the eastern shore in february. she started her own campaign to have the exlite removed from the she found support in one state lawmakers. but won't nd that anymore. e maryland state highway is replacing all exlites in the state. >> there are a 1,000 of them. a small percentage othe 52,000 we hav