was distinguished by several exterior design features. Although not legalized across the entire United States until 1958, "Quadri-Beam" dual headlamps were fitted as standard equipment (the only 1957 Mercury to do so, as well as one of very few cars from that year to be equipped as such); for states that still allowed the use of single headlights only, the Turnpike Cruiser also used the then-standard singles setup. In place of contrasting paint, the scalloped tailfins were gold-anodized. Distinguished by its retractable "Breezeway" rear window, the Turnpike Cruiser received a separate roofline, along with a windshield curving into the roof; the windshield was among the first to use tint to reduce solar glare. As a consequence of the compound-curve design of the windshield, Mercury added rooftop ventilation intakes to the Turnpike Cruiser to cover a body seam, and unusually in a secondary function, each intake also housed a fake radio antenna, as the functional radio antenna was mounted on the passenger side front fender. Coupled with the retractable rear window, the Turnpike Cruiser was among the first cars to offer flow-through ventilation; air conditioning and power side windows were additional cost options. For 1958, the Turnpike Cruiser adapted the styling changes of the Montclair and Monterey, shifting the grilles into the front bumper. The rear fascia multiple changes, as the gold-anodized trim was removed from the scalloped fins; "rocket-style" taillamps were added. To distinguish the model line from the Montclair (and Park Lane), the Turnpike Cruiser was given gold trim for its badging (including the Mercury "M" grille badge). The interior of the Turnpike Cruiser offered several features distinct from other Mercury sedans. To aid forward visibility, a flat-top deep-dish steering wheel was fitted (to match the curve of the instrument panel). Alongside a tachometer ("to measure engine efficiency"), the instrument panel was fitted with a clock to calculate average speed and a trip odometer (effectively, a trip computer). One of the first memory seats, "Seat-O-Matic" was programmable and moved down and back when the ignition was off. While not equipped with cruise control, in 1958, the Turnpike Cruiser (alongside all Mercurys) was introduced with a programmable speed warning, setting off a warning if a preset speed was exceeded. The Turnpike Cruiser standardized several Mercury safety features, including a padded dashboard (and dashboard gauges), a deep-dish flat-top steering wheel, and safety door locks; seatbelts were optional, alongside a safety harness