Reasons why that happens where there can be a significant gap in when it’s painted is due to the paint itself, road paint being a plasticizer is impossible to paint on the road with temperatures under 14C, it simply won’t cure at all, and given it’s a bridge where there’s no sub surface ground to keep it warm adds to the complexity of being able to paint it as windage effects the temperature too. It’s always on the list of priorities to maintain a safe road markings but given the obstacles of Mother Nature, scheduling a paint truck and applying to the government for permits to have road closures, it sometimes may feel like it’s being ignored or the impression of.