North East Herts MP Sir Oliver Heald has been approached by campaigners for A Safer A507 following the tragic death of a jogger on 20 June.
Campaigners are taking the matter up with Herts Highways and pressing for a 7.5 ton weight restriction and a downgrading of the status of the road.
Sir Oliver has written to Herts Highways and has pressed for a response to the campaign's demands.
Commenting, Sir Oliver Heald said: " I am a strong supporter of the safer A507 campaign and this latest tragic incident simply strengthens the case".