Is it based on a database, or is it based on reading the posted signs by camera? I'm sure the salesperson said it was by camera, but we all know how reliable salesperson speak is.

At first, I was sure it was from a database. Then I noticed it was accurate while I was driving in a two year old construction zone on the local Interstate. (55 vs 65). If it camera based, I suspect it won't always pick up every sign.

Not a big deal, and I am currently out of town, so I dont have the digital manual available to look it up. Thanks

 

I'm 90% sure it's based off of GPS fed information.

There are times where I get onto a road and I haven't passed any speed limit signs yet, but the speed limit is already updated.

 

https://owners.acura.com/vehicle-inf...2019&model=RDX

here you go

 

Probably based on database info. It seems to match Waze speed limit info.

 

I find it does NOT match Waze. Waze always seems to be correct. The Acura often is not correct. The Acura also often show no speed limit when Waze does show one.

 

So page 128 of the 2019 manual says it is "based on information complied from the navigation system"

 

Might also depend on location and if you have several road changes in road conditions between Acura updates. I don't think we had and major road changes other than repaving in the areas I mostly drive in NM in the last +10 years (ABQ, Santa Fe, Gallup, Clovis, Las Cruces). Can be different for your area and Acura Navi can't keep up. The major advantage of having Apple Car Play available. The current posted speed limit isn't a piece of info I normally need when driving.

 

The Honda Accord reads the signs, the Acura reads its database.

 

That's what I thought. Does anyone else think this is backwards?

 

If the technology to “read signs” really works well, then that sounds far better. It should always be accurate. As compared with an outdated data base.

 

The one issue I have with the method that reads signs, is when the road you're on has different speed limits for different vehicles. The display will always show the speed of last sign it passed. Even when driving through a School Zone at midnight, it shows that speed. This is how it works in my wife's CX-5 anyways. Also, until you pass a sign, you get no display.

 

When I test drove the Accord, it got a sign wrong. It was a year ago, and I don’t recall the details, but I was WTF at the in-car speed limit, and I realized the car read the wrong sign.

 

In my 2022 RDX, without the "navi", the manual states that signs are read. Having said that I pass the sign in the image, and within a very short distance, probably 20 feet, my dash display of the speed limit is 100 mph. Shortly down the road is a 55mph sign and on passing it the display states 55mph. But after another 1/4 mile, and an intersection with the route marker sign, it reverts back to 100mph. In my travels of about 5 miles on that highway, I pass about a dozen speed limit signs and about five or six of the route markers. The vehicle responds to every sign within a short distance.

 

The 2019-2021 reads from the navigation map data.

The 2022-2024 gives you the option of navigation map or camera sign recognition. Map can be outdated, and camera can be misled by highway number signs, so you can choose whichever works better.

 

whatever way it figures it out, it has some bugs. I have a '24 a-spec advance, and when I pass my kid's elementary school until i get to the next stoplight - a 25mph road - it has shown 70mph and 85 mph as the limit. No earthly idea where it gets that from. It's not a route number where it would read that sign as the speed limit. and it's nowhere near a road with 70mph limit for the gps to have a misread of which road i'm on.