KiwiNZ:

BlueShift:

Aaroona:

KiwiNZ: No they shouldn't. They are a memorial to lives needlessly lost.

Best way to stop their numbers growing is ...

*Slow down 
*Drive to the rules and drive to the conditions
*Drink zero alcohol and take zero drugs before driving
*And generally don't prat around on the roads

 While I do agree with you, good luck enforcing that. 

We have a lot of policing out and still, people are being killed on the road.

Don't get me wrong, I can appreciate it being a memorial as such, but how about this: someone dies outside your driveway. Theres now a cross and frequent flowers dropped there. You're now reminded every day you leave or enter your home that someone died right there.

We don't commemorate any other places that people die. We memorialise most people with headstones, or plaques. Some people dedicate a park bench or public building. We don't see people putting up crosses in hospitals, or nursing homes, or people's houses. My workmate died in his rented home, we didn't stick up a cross in the middle of his lounge for the landlord to deal with, we planted a tree in a green space at work, and put a bench with a plaque next to it.
I appreciate the sentiment of the roadside crosses, but there's better ways to remember the dead than attempting to sanctify the spot they they died.

There are memorials at , Cave Creek, Tangiwai, Both sides of Wellington harbour entrance etc etc 

If the placing of a memorial helps the healing process I see no harm.