I recently bought a new Honda Jazz Hybrid. It has an impressive sounding list of safety features including:
- Collision Mitigation Braking System (CMBS)
- Adaptive Cruise Control (ACC) with Low Speed Follow
- Lane Keeping Assist System (LKAS)
- Road Departure Mitigation System
I'm wondering if some of these systems could actually be less safe than not having the system at all.
The one that concerns me the most is the Road Departure Mitigation System. The owners manual says:
Alerts and helps to assist you when the system detects a possibility of your vehicle crossing over detected lane markings, or approaching the outer edge of the pavement (into grass or gravel border) or an oncoming vehicle.
Last week I was driving along the A327 when I noticed a large van coming around a corner a couple of hundred metres ahead. As it was close to the centre of the road I moved slightly left, just to be sure I didn't lose my door mirror. However, the Road Departure Mitigation System didn't like this and tried to steer me to the right, closer to the van. When I persisted in trying to keep to the left the system vibrated the steering to show its displeasure. Ultimately we passed safely, although the van driver probably wondered why the crazy old guy was weaving to and fro!
On another occasion I was driving on the A30 where it abruptly changes from single lane to two lanes and initially you are straddling the white line between the lanes. The system tried to force me into the left lane, but that is a filter for a left turn which I didn't want to take, so again I had to fight it to get in the right hand lane. Fortunately there was no other traffic at the time.
I read on a Jazz users forum of another owner who was driving along a long straight road. There was no moving traffic in sight so, as he approached a parked vehicle on the left, he pulled out to the right to pass it and the system tried to steer him back towards the vehicle. Apparently you must use the indicators to stop the system intervening in situations like this, even when there are no other road users around.
The Road Departure Mitigation System can be disabled, but it re-enables itself every time you turn the car on. To change the setting you have to press a button, scroll through a menu to select the correct system and then select to disable it.
In addition to the disturbing behaviours noted above, the owners manual gives long lists of circumstances in which the systems may not operate correctly, which makes me question whether they actually do improve safety.
What is making manufacturers add all these systems? Is it to get a better NCAP rating, or do they believe that customers want them?
|