There's belief speed humps hindered emergency responders rushing to help a dying man.

Fire and Emergency New Zealand says it's concerned Wellington roading changes are slowing response vehicles.

A man reportedly collapsed and died in his Karori home last week - with responders arriving too late to resuscitate him.

City Councillor Ray Chung claims speed humps and raised crossings are to blame.

"The firepeople said that in emergencies like this - every second is important, every second counts, you've got to get there before their heart stops beating."

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