Driver was very, very closely tail gating in a school zone. Driver would have gone easily 20-30 mph over the limit in said zone. Driver passed me after the right turn off the school zone and started speeding to around 80 mph. They ran a stop sign and freaked out other drivers at the intersection, they turned left and started speeding what could have easily been over 80 mph in a 45 zone. Drivers ahead of them at the stop sign slowed them down and they started tail gating the driver in front like crazy. It's a Dark Grey Jeep Cherokee. License plate 9JVA549