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For enhanced safety, the front and rear seat shoulder belts of the Lexus IS Series have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Cadillac CT4 doesn’t offer pretensioners for the rear seat belts.
The IS Series’ optional pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The CT4 doesn’t offer pre-crash pretensioners.
For enhanced safety, the front seat shoulder belts of the Lexus IS Series are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Cadillac CT4 doesn’t offer height-adjustable seat belts.
Both the IS Series and the CT4 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available all wheel drive, blind spot warning systems, rear parking sensors and rear cross-path warning.
For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, its standard front crash prevention system, and its headlight’s “Acceptable” rating, the Insurance Institute for Highway Safety grants the IS Series the rating of “Top Pick” for 2018, a rating granted to only 153 vehicles tested by the IIHS. The CT4 has not been tested, yet.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Lexus vehicles are better in initial quality than Cadillac vehicles. J.D. Power ranks Lexus 8th in initial quality, above the industry average. With 10 more problems per 100 vehicles, Cadillac is ranked 17th, below the industry average.
J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Lexus vehicles are more reliable than Cadillac vehicles. J.D. Power ranks Lexus first in reliability, above the industry average. With 60 more problems per 100 vehicles, Cadillac is ranked 23rd.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Lexus vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Lexus first in reliability. Cadillac is ranked 30th.
For better stopping power the IS Series’ front brake rotors are larger than those on the CT4:
The IS Series has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the CT4; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the CT4 don’t have a run-flat feature, either.
The IS Series offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The CT4’s suspension doesn’t offer adjustable shock absorbers.
For better maneuverability, the IS Series’ turning circle is 2.9 feet tighter than the CT4’s (34.2 feet vs. 37.1 feet). The IS Series AWD’s turning circle is 2.6 feet tighter than the CT4 AWD’s (35.4 feet vs. 38 feet).
The IS Series 300 RWD offers available computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The CT4 doesn’t offer active noise cancellation.
The IS Series has 2.4 inches more front legroom, 1.3 inches more front hip room, .7 inches more front shoulder room, .4 inches more rear headroom and 1.5 inches more rear hip room than the CT4.
With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the IS Series offers cargo security. The CT4’s non-lockable folding seat and non-lockable remote release defeat cargo security.
The IS Series uses gas struts to support the hood for easier service access. The CT4 uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.
J.D. Power and Associates surveys of service recipients show that Lexus service is better than Cadillac. J.D. Power ranks Lexus second in service department satisfaction. With a 1% lower rating, Cadillac is ranked third.
Unlike the driver-only memory seat and mirrors in the CT4 Premium Luxury/Sport, the IS Series offers an optional driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.
The IS Series’ front and rear power windows all open or close with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The CT4’s rear power window switches have to be held the entire time to close them fully.
If the windows are left open on the IS Series the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. (This window function must be activated by your Lexus service department.) The driver of the CT4 can only close the windows from inside the vehicle, with the ignition on.
The CT4 Premium Luxury/Sport’s optional cornering lamps activate a lamp on the front corner when the turn signal is activated. The IS Series’ optional adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.
A power rear sunshade is optional in the IS Series to help block heat and glare for the rear passengers. The CT4 doesn’t offer a rear sunshade.
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