Firstly, you can make it easy for your partner to say yes to your proposal by identifying the advantages involved. Help your partner to see how valuable accepting your proposal really is. Strategically highlighting the good road condition on your lane will help your partner to decide walking this particular lane. Beyond letting the surface-level facts speak for you, remember to make it even easier for your partner to say yes by taking care to meet their actual interests. What is your partner really looking for, and does your proposal meet this interest well? If your partner is looking for a stepp climb and you are offering a trail through the Himalayans that really must be the way to go!
Secondly, make it difficult to say no to your proposal by helping your partner to identify the disadvantages of other options. Take a look a the other lanes leading away from your negotiating junction. What does your partner think will happen if he takes them rather than the road you suggested? Help your partner to identify that other options do not meet their interests as well as your proposal.
Psychologist Robert Cialdini (1984) identified which heuristics and biases we are influenced by when we are being persuaded. He found 6 principles that guide us when being persuaded, and that persuaders can therefore apply to address the not-perfectly-rational side in their negotiating partners.
Social Proof: Follow herd instinct. The crowd does not err - or so it seems. Public support for an idea or product therefore can create a strong incentive to follow the example of the crowd. Your negotiating partner is therefore more likely to agree to your proposal if you or the proposal itself have received social proof and public support.
Scarcity: Limitation makes demand. Rare things are always in high demand. Think about diamonds: would they really be so sought-after and high-priced if the real-deal-diamonds were not so rare and tricky to come by? Making yourself a bit scarce can therefore be helpful in tipping a decision in your favor. Signaling that your deal will not be available indefinitely, because you ultimately of course have other options as well, may create just the right amount of scarcity to spike your partner's interest in saying yes. If you season your application of the scarcity principle with the right amount of encouragement for a cooperation to avoid creating a threatening message, your persuasion is on the track to get you to yes.