Lead is well written and appears to be a good summary of the article. The infobox is informative, and the picture appears to be of correct public use tag.
Route description
"Highway 400A is a short highway with a narrow grass median for the majority of its length." - The length of the road isn't included in this paragraph like it was in the lead. I think a better opening sentence would read something like this: "Highway 400A is a 1.1-kilometre (0.68 mi) 400-series highway located in the Canadian province of Ontario."
I would then follow that with a comprehensive sentence such as: "The unisigned freeway includes a narrow grass median for the majority of its length, and features a speed limit of 100 kilometres per hour (62 mph)."
"In 1950, the freeway was extended north through Barrie..." - To make it easier for the reader, I would clarify that "...the freeway was extended north through the town of Barrie..." and then link to the town. I know that it is linked in the infobox, but not everyone reads that.
Same with Crown Hill. Is that a town? If so, it seems that when I looked it up, it appeared to be name Springwater instead.
Crown Hill was at one point a small crossroads village located at Hwy 93 and Hwy 11, but it is long gone. Today, the name is synonymous with the Hwy 11 and Hwy 93 junction. - Floydianτ¢21:26, 4 September 2014 (UTC)reply
That is all I saw that needed to be addressed. I can't check the items in the GA Toolbox at the moment, but should be able to later on this evening. Thank you for your efforts, and I look forward assisting you in gettin this promoted.Neonblaktalk - 18:19, 2 September 2014 (UTC)reply
My responses are indented. Thanks for the review! The external link checker comes up clean, but the dab link checker went down with Toolserver. Cheers, Floydianτ¢21:26, 4 September 2014 (UTC)reply