I took a look at Google Street View for that highway interchange. The problem here is how Apple seems to be automatically pulling data from their vehicles, and implementing them into directions.
When exiting a highway, Apple Maps will direct you "towards" the exit using information gathered from the last sign visible just before the exit. If the sign is large, and contains lots of route information, Apple Maps will typically deduce what is necessary based on your next move, and ignore the rest.
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But, if the last highway sign at your exit is "split" into multiple signs for multiple exits within the interchange, I've noticed that Apple Maps will tend to only read the information on the left-most sign (including the exit number), but still mention the road you need out loud. Although it sometimes has a habit of reading off something from the incorrect sign also.
In your case, your exit direction is SHOWING you that you're headed towards State Route 202, but it's TELLING you to take Exit 147B towards State Route 51, because that's what the left-most sign says.
There's a secondary problem. Once you're on the exit ramp, why isn't Apple Maps giving you lane guidance? At that point, wouldn't it specify now to stay right onto Exit 147A towards State Route 202?
NO. And here is why.
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Notice how the interchange is drawn. Once you leave I-10 onto the exit ramp towards State Route 202, notice how the road is drawn thick yellow, like the rest of the highways? Apple Maps is treating this road as part of Route 202 itself, rather than as an exit ramp. And because of this distinction, the directions ignore the exit ramp split for Exits 147A and 147B, because it believes you're already on the main highway it expects you to be on. I'm experiencing this problem a TON in New York City. I've reported this at least a dozen times at various locations, but none of have fixed yet.
So there are two problems here. The first, is that the automated directions are pulling incomplete information from the exit signs at certain interchanges. The second, is that certain complex interchanges between different highways sometimes have their ramps mistakenly drawn as part of the main highway itself, ESPECIALLY if it's where one highway begins or ends. This can cause directions to be less specific, or downright confusing, because Maps will always assume you're following the "main road", if it's not instructing you to exit off of it.
