An Auckland cyclist confronted a bus driver who pulled into his lane while driving along Broadway, Newmarket.

An Auckland cyclist who was cut off by a bus, almost causing him to crash, says bus drivers need to be taught correct road rules.

The bus driver defended his actions, saying cyclists should not take up a whole lane. But that is wrong.

Cycle commuter Alec Tang had every right to be where he was.

SUPPLIED Alec Tang is a cycling advocate and regularly takes to social media to vent his frustrations about careless drivers.

Tang captured the moment on a camera on his bike helmet the moment the bus merged into his lane, forcing him to the side.

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Tang confronted the bus driver who insisted Tang as a cyclist was at fault for taking up a whole lane.

@AlecTang_/TWITTER Alec Tang captured the moment a bus pulled into his lane on camera.

But police say the bus was in the wrong and road rules state that a cyclist has the right to ride in the middle of a lane.

The incident happened an 5.15pm on Monday, while Tang and the bus were travelling south along Newmarket's Broadway.

Tang's video shows the bus indicating and moving into Tang's lane from the right, requiring Tang to take defensive action.

Tang was forced to the extreme left hand side of the road near the street's Lush store.

A few metres later, when the two came to a stop at the red light at the intersection with Remuera Rd, Tang got off his bike and confronted the driver.

"Come'on man, you know you just merged into me without actually looking; without actually paying attention to a cyclist."

The driver replied: "hold on, hold on, you cannot take the whole lane."

"I can, it's called defensive driving," Tang said.

A police spokeswoman said that on the face of it, it appeared that what happened was an unsafe lane change by the bus driver.

"The cyclist has every right to use the lane on the road and unsafe or intimidating behaviour by larger vehicles against vulnerable road users should not be tolerated."

Auckland Transport spokesman James Ireland acknowledged it was essential that bus drivers share the road with bike riders.

"AT will work with NZ Bus to investigate this incident and ensure the appropriate action is taken."

In a tweet to Auckland Transport about the incident, Tang said "this driver needs to be taken off the road until he learns the road rules".

"'You cannot take the whole lane' is not an excuse for merging into me and [it is] just plain wrong."

Tang said the incident left him on edge.

"One of the messages I'm trying to get across is that it's not just about cyclists but all forms of more vulnerable road user; including mopeds, scooters, even the electric skateboards I've seen flying around.

"We're going to see more of these on our roads and everyone needs to be more aware, better educated, patient and compassionate.

"When I see and hear professional drivers like the individual yesterday evening though, it does make me pretty upset."

According to the New Zealand Transport Agency's website, the same give way laws apply to cyclists and motorists, but to avoid injury cyclists should always take care in case other people don't stop or slow down.

It said cyclists should be hyper-vigilant of their surroundings.

"Try to get an idea of what other people are going to do.

"Have a good look around and try to make eye contact with the road users that should be giving way to you, so you can check that they have seen you."

This wasn't the first potentially serious incident the cycle-advocate had experienced on the road either, mid-April a car opened a door right in his path, knocking him off his bike.

He said the incident was a good argument for installing more protected cycleways around the city.