Yes indeed, Good Samaritans are kosher. It is a worthy good deed to stop to help a traveler who is in need of assistance.
The Road Warrior column in the Bergen Record took up the issue of good Samaritans who stop to help motorists in New Jersey. From the fact that this is considered newsworthy and unusual, the columnist moves into many aspects of the act - how the recipient feels, whether one should be wary of offers of help and related questions.
And I am quoted in the article. That's because I am on the writer's panel of readers from whom he solicits quotes on issues that he tackles. My quote points out that in Minnesota, where I lived for many years, it was taken for granted that people would stop to help a motorist in trouble, especially during the harsh weather of the winter.
Here is the link to the article.