For street safety, I mostly followed the Letter People curriculum.
First we made traffic signs by cutting shapes out of the correct color construction paper, tracing the words, and gluing them to Popsicle sticks. On the playground, I taught the kids how to play 'red light, green light' using the signs. Although it took awhile for them to understand the rules, by the end of recess they all were playing the game together, using their own signs to play. This was a great way to check their understanding of the concept.
We also made cars out of toilet paper rolls from http://www.handimania.com/diy/toilet-paper-roll-race-cars.html after leaning about car safety,
like wearing your seatbelt and staying in your seat. The kids loved playing red light green light with the cars,
as well as racing them, down the slide!
This stoplight color sorting activity was a great one to practice the skill of color sorting while learning about the stoplights.
For fire safety, we did this Don't Hide, Go Outside activity from http://www.allkidsnetwork.com/crafts/fire-safety/ after discussing what
to do if your house is on fire.
The kids also practiced stopping, dropping, and rolling, and colored a certificate to show they could do this.
Finally, the kids made their own firehose by attaching blue construction paper to the end of paper towel rolls.
I don't have a picture of this, but its from: