Summarize this article in one sentence.
The easiest way to see if your partner is on the same page is to ask first! You need to check both that your partner is interested in getting more physical with you, and that they're comfortable with doing so in a car in a potentially more hidden area. You should definitely have had some sort of basic physical contact, such as light kissing or hand-holding, before initiating a make-out session. You can see how your partner feels about getting more physical by saying something like, "I would love to find a more private place to kiss you. Would you like that?" Tell your partner where you're planning on taking them before you drive to a more remote area. It may be tempting to keep it a surprise in order to make it feel more romantic, but you may end up killing the mood instead, as some people may be worried for their safety if you unexpectedly drive to an area where no one else can see you. If it's dark outside, turn your headlights off to make you and your partner less noticeable. Double-check that both your partner as well as anyone else who may see you will not feel uncomfortable. Some people don't like public displays of affection, and your partner may not want to kiss you where other people could see. Kissing in public is not against the law in most places, but if you want to escalate things beyond kissing, you may need to move to a more private spot indoors. If an act is illegal in public, then it's illegal to do in a car that's parked in a public spot. Try giving them compliments, like "you look so cute right now!" Keep the mood light and don't try to push things forward too quickly. Initiate light physical touch, such as putting your hand on your partner's knee, if your partner is clearly engaged in the conversation and is reciprocating your touches. Try to build towards a moment where you are locking eyes with your partner, as this is usually when a kiss happens. But be careful not to stare intensely at your partner, as this can be seen as creepy! Wait for a moment where your partner is looking into your eyes, and lean over and kiss them on the lips. Start slowly, by keeping the kiss light, touching safe areas like their face or shoulder, and changing positions slowly. Build the kiss gradually by slowly escalating your touches and only proceeding if your partner is enthusiastically responding. Keep the kiss interesting by occasionally breaking apart to look into your partner's eyes or ask them if they like what you're doing. Every once in a while, move your hands to a new location, such as their hair, neck, hands, or leg. You may need to ask your partner to hold on for a second, and make some minor adjustments or ask them if they're interested in moving to the back seat. Slide your seats backwards and tilt the seats back if you're in the front seat. If you're in a vehicle with a bench seat, you may be able to just tilt the seats back and then lie down across the seat. If there is a gearshift in between the two front seats, and you don't want to lean over it, it may help for both of you to move over to the passenger seat, where there's no steering wheel or pedals to get in the way. Move the front seats forward if you're going to hop in the back of the car. Try to make as much room as possible for you and your partner by sliding the seats up and flattening the backseat down into the trunk, if possible. It can be hard to get physically comfortable when making out in a car, and you may have to adjust frequently. Furthermore, you should make sure your partner is feeling good about how far and how fast things are progressing. Get verbal consent by telling your partner what you want to do before you do it. For example, as you're kissing, tell your partner something like, "I'm going to slide my hand under your shirt," and wait for them to tell you yes or give you a non-verbal sign, like kissing you more enthusiastically. Pay attention to your partner's body language. Anytime you escalate your physical touch, read your partner's reaction. If they lean in closer, or touch you back in the same way, that's a good sign that they like what you are doing. If your partner moves backwards, stops what they're doing, or doesn't give you much of a response back, then pull back, as these are all physical ways of giving someone a "no."

Summary:
Check that your partner is comfortable with what you have in mind. Make sure you're parked in a secluded area. Build up the mood by flirting with your partner. Initiate light kissing, and build from there. Adjust your car seats if the kiss continues to escalate. Check in with your partner frequently to make sure they're feeling comfortable.