Google's Waymo shows off their self-driving car technology in an advertisement. A Chrysler Pacifica hybrid outfitted with Waymo's suite of sensors and radar is displayed at the North American International Auto Show in Detroit in January 2017. PHOENIX -- A self-driving vehicle operated by Waymo was involved in a crash Saturday night in Mesa, Arizona, officials said. The five-car collision happened about 10 p.m. Saturday. The self-driving van was not in autonomous mode at the time of the crash, said a spokesperson for the Mesa Fire and Medical Department.

The tech is pretty cool, but don't let new developments in self-driving cars distract you from your responsibilities behind the wheel. Ford's Co-Pilot360 system offers an array of driver-assist features that including automatic emergency braking. One of the most common semi-autonomous driving features added to cars these days is automatic emergency braking. This feature stepped into the spotlight in two recent crashes for different reasons, one involving an Uber self-driving car in Arizona in March and another involving a Tesla Model S in Utah a few weeks ago. What can it do -- and what shouldn't a driver expect it to handle?

Electric carmaker Tesla has confirmed its "Autopilot" feature was engaged during a fatal crash last week, a development set to exacerbate concerns over the safety of futuristic vehicles. Autopilot is still far from a completely autonomous driving system, which would not require any involvement by a human. Autopilot is considered part of the second of five levels of autonomous driving, with the fifth being fully autonomous - something once featured in futuristic cartoons but which has moved closer to reality. A Tesla Model X - the latest model - collided with a highway barrier near the town of Mountain View in California on March 23, catching fire before two other cars struck it. The driver was identified by The Mercury News as a 38-year-old man, Wei Huang, an engineer for Apple.

Arizona Gov. Doug Ducey has suspended Uber's ability to test self-driving vehicles in the state following last week's deadly crash. The crash, which occurred late at night in the Phoenix suburb of Tempe, killed 49-year-old Elaine Herzberg as she was walking her bicycle across a dimly lit city street. In a letter sent Monday to Uber CEO Dara Khosrowshahi, Ducey called the incident an "unquestionable failure" to meet public safety expectations. ICYMI: Governor @DougDucey's letter to the CEO of Uber suspending the company's ability to operate autonomous vehicles in #Arizona pic.twitter.com/qhYWyEsiiw The local police chief initially called the incident "unavoidable" but sentiment quickly changed after the release of video of the crash.

Tempe police have released two angles of a fatal crash involving a self-driving Uber SUV and a pedestrian on March 18, 2018. Gov. Doug Ducey on Monday sent a letter to the CEO of Uber saying he was suspending the ride-sharing company's tests of self-driving cars on Arizona roads following a fatal accident March 18 in Tempe. That night, a self-driving Volvo operated by Uber struck and killed a pedestrian who was jaywalking on Mill Avenue near Arizona State University. Uber pulled its self-driving cars off the roads, but after video was released of the accident last week, Ducey said he needed to act to protect the safety of Arizonans. "Improving public safety has always been the emphasis of Arizona's approach to autonomous vehicle testing, and my expectation is that public safety is also the top priority for all who operate this technology in the state of Arizona," Ducey said in his letter to CEO Dara Khosrowshahi.

In response, Uber on Monday temporarily pulled its self-driving cars off the roads where it has been testing them in four cities. An Uber spokeswoman said the company is investigating the incident and cooperating with authorities. Police in Tempe, Ariz., said the Uber vehicle was in autonomous mode with a human safety operator at the wheel when it hit 49-year-old Elaine Herzberg on Sunday night while she was walking her bicycle outside of a crosswalk. The woman later died from her injuries, according to a police statement. While it isn't clear yet whether Uber's vehicle was at fault in the accident, the fatality confirmed the fears of those who have warned for several years that someone would eventually die from driverless cars.

An Uber autonomous SUV was involved in a three-vehicle collision in Tempe on March 24, 2017. The car on its side is the Uber vehicle. The Tempe, Ariz., police department released the accident report Wednesday, March 29, 2017. The driver who made the left turn was cited for failing to yield the right of way, police said. The driver of the Uber vehicle was not cited.

Uber's self-driving test car was not to blame for the horrific crash in Arizona, a police report has confirmed. The report states that the crash occurred after the human-driven vehicle failed to give way to oncoming traffic. But the incident has exposed how Uber's self-driving cars aren't equipped to cope with the unpredictable driving of humans, critics have warned. The report, from Tempe Police Department, states driver Alexandra Cole attempted to cross three lanes of traffic as the traffic lights at her intersection turned from green to yellow (amber). She crossed the first two lanes at the speed of 20mph (32km/h) and then attempted to enter the third lane.

A self-driven Volvo SUV owned and operated by Uber Technologies Inc. is flipped on its side after a collision in Tempe, Arizona, U.S. on March 24, 2017. Picture taken on March 24, 2017. Uber Technologies Inc. on Saturday halted a pilot program for self-driving vehicles following an accident on Saturday in Arizona. The accident took place in the city of Tempe after the driver of a second vehicle made a turn and failed to yield to a self-driving Uber, police said. Two drivers were sitting in the front seats of the Uber car when the crash took place, the company told Reuters.