As with many of worst episodes of Seinfeld, this is perfectly watchable and even quite funny, but sadly at least two of the storylines here jump the shark in quite a massive way. Because of the way all the plot threads in Seinfeld interconnect at the end, this has the effect of making the other two, funnier storylines also seem weak.
The two shark jumping plotlines belong to Elaine and Kramer. Elaine starts pretending to live in a janitor’s closet when a food delivery service refuses to send orders to her side of the street. This refusal, or at least the takeaway's refusal to meet her half way, seems pretty unrealistic and makes it hard to get involved in this plotline.
Kramer meanwhile adopts part of a highway. This in itself is pretty funny, as is the fatherly pride Kramer adopts immediately after doing so. However, the turns this story takes as Kramer's paternal love for his road manifests itself become pretty over the top.
On the other hand, Jerry's storyline works a lot better because it is believable. In it, germ phobic Jerry develops a reluctance to kiss his girlfriend (played by beautiful future Sex & the City star Kristen Davis) after he drops her toothbrush in the toilet and doesn't tell her about it before she brushes her teeth. I'm sure most people, whether they're obsessive about cleanliness or not, would react to this situation in a similar way.
This episode is worth watching as it is funny despite some of its ridiculous plot aspects.